What Defines a Travelodge Double Room?

When considering a stay at Travelodge, understanding the 'double room' designation is paramount for ensuring your accommodation meets your expectations. A Travelodge double room is designed primarily to house two guests, furnished with a single double-sized bed. This configuration is a staple across the Travelodge UK network, offering a consistent baseline for travellers seeking dependable lodging.

  • Standard Travelodge double rooms feature one double bed.
  • These rooms are configured for two adult occupants.
  • En-suite bathrooms are a standard inclusion.
  • Amenities aim for comfort and convenience during short stays.

The core purpose of a double room at Travelodge is to provide a practical and comfortable space for couples, or for solo travellers who prefer a bit more room. It represents the most common room type found within the brand's extensive portfolio, aiming to offer a reliable standard regardless of the specific hotel location. This consistency is a key selling point for many of its patrons who value predictability in their travel arrangements.

While the term 'double room' is straightforward, the specifics of what you can expect often extend beyond just the bed. Travelodge rooms are generally appointed with essential amenities designed to facilitate a convenient stay, whether for business or leisure. This includes furniture such as a bedside table, a desk area, and often a wardrobe or hanging space for clothes. The objective is to provide functionality without unnecessary complexity, aligning with the brand’s value-driven approach to hospitality.

The presence of an en-suite bathroom is a significant feature, providing private facilities that include a toilet, washbasin, and shower. This self-contained setup is crucial for guest comfort and privacy. Unlike some higher-end hotels, you won't typically find luxury extras like separate bathtubs or extensive toiletries, but the shower is consistently functional and clean. The bathroom is designed with efficiency in mind, ensuring that guests have everything they need for their daily routines.

Crucially, when booking a Travelodge double room, it's important to note that while the bed size and basic layout are standard, minor variations can exist. Older hotels might have slightly different room dimensions or décor compared to more recently refurbished properties. However, the fundamental offering – a clean, comfortable space for two with private facilities – remains the brand's promise. This reliability underpins its appeal to a broad spectrum of travellers.

Core Amenities and Features in Your Travelodge Double Room

What can you reliably expect to find within the four walls of a Travelodge double room? The brand has established a clear set of standard amenities designed to cater to the needs of the modern traveller, focusing on practicality and comfort. These features are present to ensure that your stay is as hassle-free as possible, from checking in to checking out.

At the heart of the room is the double bed, typically featuring a comfortable mattress and clean, crisp bedding. Alongside the bed, you'll usually find a bedside cabinet, often equipped with a lamp to provide ambient lighting. This space is crucial for keeping essentials like your phone, book, or glasses within easy reach during the night.

A dedicated workspace is another common feature. Travelodge rooms often include a desk or a table area, usually accompanied by a chair. This is particularly beneficial for business travellers who need to catch up on work, or for anyone needing a stable surface to use a laptop or organise travel documents. Power sockets are generally located conveniently near this desk area, although it is always wise to pack an extension cord if you anticipate needing multiple charging points.

For storage, expect to find a wardrobe or a set of drawers. This offers sufficient space to hang a few items of clothing or stow away your luggage, helping to keep the room tidy. While not always extensive, it's enough for short to medium-length stays. Smaller rooms might offer fewer hanging clothes options, focusing more on drawers or shelf space.

In-room entertainment is typically provided via a television, which is often wall-mounted or placed on a small unit. These TVs usually offer a range of Freeview channels, providing options for relaxation or catching up on news. Wi-Fi is generally available, though often at an additional charge, which can be purchased through their network provider. Check the hotel's specific policy upon arrival as free Wi-Fi is becoming more common in some locations.

Refreshment facilities are a key consideration for many guests. While not all Travelodge double rooms come equipped with a kettle for making hot drinks, many do. If provided, you will typically find sachets of tea, coffee, and sugar, along with milk portions. For those rooms without an in-room kettle, or for guests who prefer to purchase their own beverages, the hotel’s public areas or nearby vending machines may offer alternatives. It is always worth confirming this amenity before booking if it is a priority for your stay.

The standard provision of a desk and chair supports productivity for guests needing to work remotely.

Regarding food and drink preparation, it is important to clarify what is typically absent. You will not find a minibar, refrigerator, or microwave in standard Travelodge double rooms. This is a deliberate design choice aligning with their budget-friendly model. For guests wishing to store perishable items or prepare their own meals, this means planning ahead by consuming or discarding such items before arrival, or utilising hotel vending machines or nearby convenience stores.

The en-suite bathroom is a definitive feature, comprising a shower cubicle, toilet, and basin. Complementary toiletries are usually limited to a bar of soap or a small liquid soap dispenser, and perhaps a shower gel/shampoo combo. Towels are, of course, provided. The focus here is on essential cleanliness and functionality rather than luxury spa amenities. The shower is usually a walk-in cubicle, designed for efficiency and ease of use.

Variations and Room Types: Beyond the Standard Double

While the standard Travelodge double room forms the backbone of their accommodation offering, the brand occasionally introduces variations or supplementary room types to cater to slightly different needs. Understanding these can help you make the most informed booking decision, ensuring you select the room that best suits your travel party and preferences.

The most common distinction beyond the standard double room is the "SuperRoom" double. These are essentially upgraded versions of the standard room, offering enhanced amenities and a slightly more premium feel. While they still feature a double bed, SuperRooms typically include additional comforts such as a rainfall shower, a wider selection of premium toiletries, and often a greater variety of hot drink-making facilities, including a better quality kettle and a wider range of teas and coffees.

The Travelodge SuperRoom double offers enhanced comfort and amenities over the standard offering.

Another significant upgrade often found in SuperRooms is improved connectivity and in-room technology. This might include more readily available power sockets, USB charging points, and sometimes even an iron and ironing board provided directly in the room. The aim of the SuperRoom is to provide an elevated experience for guests who might be willing to pay a little more for added convenience and comfort, without stepping up to a different hotel brand entirely. If you are seeking a bit more luxury or convenience, a Travelodge SuperRoom double is worth considering.

It is also worth noting that while the term 'double room' inherently means one double bed for two people, some Travelodge hotels may offer rooms that can accommodate families or groups with additional sleeping arrangements. These are typically advertised as family rooms, which might contain a double bed plus a sofa bed or pull-out beds. However, the specific configuration of family rooms can vary significantly from one Travelodge hotel to another. If you require a family room, it is advisable to check the specific offerings for the hotel you intend to book.

In terms of location, certain Travelodge hotels are situated in unique settings, such as in or near major cities, transport hubs, or even in spa towns like the Travelodge Bath Spa. While the core room offering remains consistent, a room in a prime city location might have a different outlook or be subject to slightly different noise considerations compared to a room in a quieter, suburban or rural setting. This is more about the external environment than the internal room specification.

For those concerned about accessibility, Travelodge has a programme of accessible rooms. These rooms are specifically adapted to assist guests with mobility impairments, featuring wider doorways, accessible bathrooms with grab rails, and turn-around space within the room. While not exclusively 'double rooms' in the traditional sense, they are designed with the same aim of accommodating two guests and will often contain a double bed, but with the necessary adaptations for accessibility. Booking these requires specific selection during the reservation process.

When comparing a standard double room with a SuperRoom double, the key differentiators lie in the perceived luxury, enhanced amenities, and the inclusion of items like better quality bedding, more plentiful toiletries, and superior in-room beverage facilities. The SuperRoom aims to offer a more complete package for a short stay, bridging the gap between budget and mid-range accommodation.

Booking Your Travelodge Double Room: Tips and Considerations

Securing the right Travelodge double room for your needs involves a straightforward booking process, but a few strategic considerations can enhance your experience and ensure you get the best value. Travelodge operates a direct booking system, primarily through its website and mobile app, with telephone booking also available.

When you search for accommodation on the Travelodge website, you will typically select your desired hotel location, dates, and the number of guests. The system will then present you with available room types. For two adults, the 'double room' will usually be the default or primary option. If available and desired, you will also see options for 'SuperRoom' doubles, which will be priced accordingly higher.

Always compare the price difference between a standard double room and a SuperRoom double for your specific dates.

The pricing for a Travelodge double room is dynamic and can vary significantly based on demand, location, and how far in advance you book. Booking further in advance generally offers better rates, especially during peak travel periods or for popular locations. Travelodge frequently runs promotional offers, so it is worth signing up for their newsletter or checking their website regularly for deals. These discounts can make a significant difference to the overall cost of your stay.

When making your booking, pay close attention to the booking confirmation. This document will detail the room type booked, the duration of your stay, and the total cost. It is advisable to keep this confirmation handy, either digitally or as a printout, for easy reference upon arrival at the hotel. Errors in bookings are rare, but having your confirmation readily available can resolve any potential discrepancies quickly.

One crucial aspect to consider is the hotel's specific amenities. While core features are consistent, some Travelodge hotels may offer additional services or facilities that are not universally standard. For instance, while many Travelodge hotels have on-site parking, the availability and cost of the Travelodge car park can vary. Some hotels might offer free parking, while others may operate a paid system or have limited spaces. If parking is essential, verify this directly with the specific hotel before you book, or check the hotel's page on the Travelodge website.

Similarly, inquire about breakfast arrangements. While Travelodge hotels often have an on-site restaurant or cafe serving breakfast, the specific offering—such as whether it's a buffet or à la carte, and its cost—can differ. Some locations might offer a 'Breakfast to Go' option for a quicker, more budget-friendly meal. Checking the Travelodge UK breakfast times and options for your chosen hotel is advisable if you plan to dine there. Often, you can pre-book breakfast at a discounted rate when you book your room.

For guests who rely on specific services, such as early check-in or late check-out, it is important to understand Travelodge’s policies. Standard check-in times are usually in the afternoon, with check-out in the morning. While requests for early or late access can sometimes be accommodated subject to availability and potentially a fee, these are not guaranteed. It is best to contact the hotel directly on the day of arrival or departure to make such arrangements.

Finally, consider the terms and conditions of your booking. Travelodge offers different booking options, including flexible and non-flexible rates. Non-flexible rates are typically cheaper but come with stricter cancellation policies, often meaning no refunds if you need to change your plans. Flexible rates offer more freedom to cancel or modify your booking, usually up to a specified time before your arrival date, but at a higher initial cost.

Travelodge Double Room vs. Other Accommodation Options

When planning a trip, choosing the right type of accommodation is crucial. Travelodge double rooms occupy a distinct position in the market, often compared against other budget hotel chains, independent B&Bs, and even higher-tier hotels. Understanding these comparisons helps in making a decision that aligns with your priorities, whether that's cost, comfort, or convenience.

Compared to other major budget hotel chains in the UK, Travelodge typically offers a consistent experience across its network. The standard double room provides a no-frills, clean, and functional space. While specific amenities might differ slightly between brands, the core offering—a bed, bathroom, and basic furniture—is similar. However, Travelodge often distinguishes itself with its widespread locations, including many in town centres and near popular attractions, making the Travelodge double room a convenient choice for many.

The value proposition of a Travelodge double room lies in its predictable comfort and widespread accessibility.

Independent Bed & Breakfasts (B&Bs) offer a contrasting experience. B&Bs often provide a more personal touch, with unique room décor and locally sourced breakfast options. They can offer a warmer, more homely atmosphere. However, the level of service, amenities, and consistency can vary significantly between individual establishments. A B&B might be more expensive than a Travelodge double room, especially if it includes a substantial breakfast, but may lack the standardized facilities like a 24-hour reception or extensive car park facilities found at larger Travelodge hotels.

When considering hotels that are a step up, such as those in the mid-range or upper-mid-range bracket, the differences become more pronounced. These hotels commonly offer superior room amenities like en-suite bathrooms with bathtubs, kettles for making hot drinks, mini-fridges, larger televisions, and more extensive toiletries. Some may even offer room service or have on-site restaurants with a wider menu selection. While a Travelodge double room is designed for essential comfort and affordability, these higher-tier hotels focus on providing a more luxurious or comprehensive guest experience.

The Travelodge SuperRoom double attempts to bridge this gap. By offering enhanced amenities like rainfall showers and upgraded toiletries, it appeals to guests who seek a bit more comfort than the standard budget offering but do not require the full amenities of a premium hotel. This makes it a competitive option for travellers looking for a balance between cost and quality of stay.

For business travellers, the comparison often hinges on workspace facilities and Wi-Fi. While Travelodge rooms provide a desk, the speed and reliability of Wi-Fi, and the availability of ample power sockets and USB ports, might be more advanced in mid-range or business-focused hotels. However, the cost-effectiveness of the Travelodge double room, especially when booking multiple rooms or for extended stays, can make it a viable option, provided the workspace requirements are modest.

Ultimately, the choice between a Travelodge double room and other accommodation types depends on individual priorities. If budget is the primary concern and a clean, safe place to sleep with private facilities is the main requirement, Travelodge excels. If a more personal touch, unique character, or extensive amenities are sought, other options might be more suitable. The Travelodge Bath Spa, for instance, offers a specific location advantage that might appeal beyond just the room type itself.

Travelodge Hotel Breakfast: What to Expect

For many travellers, breakfast is an integral part of the hotel experience, and understanding the Travelodge breakfast offering is key to planning your day. Travelodge provides breakfast services at most of its hotels, typically served in the hotel’s on-site restaurant or cafe area. The format and availability can vary slightly, so it’s wise to check the specifics for your chosen location.

The most common Travelodge breakfast option is the buffet-style service. This usually includes a selection of hot items such as bacon, eggs, sausages, beans, and sometimes hash browns or mushrooms. Complementing the hot selection, you will find a range of continental options. These typically include cereals, toast with various spreads, pastries, yoghurts, and fresh fruit. A selection of juices, tea, and coffee is also generally available.

The Travelodge UK breakfast buffet offers a wide variety of hot and cold options for guests.

The price for the Travelodge hotel breakfast buffet is usually a fixed amount per person. Children often eat for free when accompanied by a paying adult, a policy that makes it particularly attractive for families. It is often possible to pre-book breakfast when you make your room reservation, which can sometimes be at a discounted rate compared to paying on the day. This also saves time on the morning of your departure.

For guests needing a quicker or more portable option, some Travelodge hotels may offer a 'Travelodge Breakfast to Go' service. This typically comprises a pre-packaged meal, such as a breakfast sandwich or pastry, along with a hot drink. This is ideal for travellers who are short on time or prefer to eat on the move, perhaps heading to a nearby train station or airport.

It is important to note that not every Travelodge hotel will have the exact same breakfast setup. While the core offerings are consistent, the variety of hot items or the specific types of pastries available might differ. If you have specific dietary requirements or preferences, it is recommended to contact the hotel directly in advance to inquire about their specific Travelodge breakfast menu and any available options for vegetarians, vegans, or those with allergies. While efforts are made to cater to common needs, specific dietary provisions can vary.

The Travelodge breakfast times are generally set to accommodate both early risers and those wishing for a more leisurely start. Weekday hours typically begin early, often around 6:30 AM, and extend through to around 10:00 AM. Weekend and public holiday hours might differ slightly, often starting a little later and finishing later to accommodate guests’ schedules. Always confirm the exact Travelodge breakfast times for your specific hotel to avoid disappointment.

When considering the value, the buffet breakfast at Travelodge provides a substantial meal that can fuel you for the day ahead, often at a competitive price point, especially with the free children's offer. For solo travellers or couples, the cost should be weighed against the convenience and the alternative of purchasing breakfast separately at a café or shop, which may or may not be cheaper or as comprehensive.

Do Travelodge Rooms Have Fridges?

A common question for travellers is whether Travelodge rooms are equipped with a refrigerator. The straightforward answer for standard Travelodge double rooms is no, they do not typically include a fridge. This is a characteristic feature of most budget hotel chains, including Travelodge, which aims to keep room costs down by focusing on essential amenities.

The absence of an in-room fridge means guests cannot store perishable food items or keep drinks cool overnight. This is a significant consideration for travellers who might wish to bring their own snacks, drinks, or specific dietary items that require refrigeration. If you are travelling with medication that needs to be kept cool, you should contact the hotel directly in advance to see if they can offer a solution, perhaps by storing it in their staff-only refrigerators.

Standard Travelodge double rooms do not include in-room refrigerators.

While standard rooms lack this facility, it is worth noting that the Travelodge SuperRoom double, designed as an upgrade, may sometimes include enhanced amenities. However, even in SuperRooms, a refrigerator is not a guaranteed feature. The focus for SuperRooms is more on improved comfort in the sleeping area, better bathroom facilities like rainfall showers, and upgraded in-room beverage making supplies, rather than refrigeration.

For guests who require chilled storage, alternative strategies must be employed. Many travellers opt to purchase drinks and snacks shortly before they need them, or rely on vending machines located within the hotel, if available. Some Travelodge hotels may have communal vending machines offering cold beverages. If you are on a longer trip and need to keep items cool, you might consider using a portable cooler bag, though you will need to find a way to keep ice packs frozen, which can be challenging without access to a freezer.

The decision not to include fridges in Travelodge double rooms aligns with their business model of providing affordable, functional accommodation. High-cost items like refrigerators add to the initial purchase price, ongoing energy consumption, and maintenance costs, all of which would inevitably be passed on to the consumer through higher room rates. By omitting these features, Travelodge maintains its competitive pricing in the budget hotel sector.

If a refrigerator in the room is a critical requirement for your stay, you would likely need to look at hotels in a higher price bracket, such as mid-range or premium hotel chains, where these amenities are more commonly standard. Always check the specific hotel’s room details on the Travelodge website or contact them directly if you have any doubts about the amenities available in a particular room type or location.

Travelodge Room Service and Other Services

When staying at a Travelodge, understanding the available services beyond the room itself can enhance your overall experience. Travelodge has traditionally focused on providing efficient, no-fuss accommodation, which means certain services common in other hotels may not be standard. One such service is traditional room service.

Travelodge does not typically offer a comprehensive in-room dining service where you can order a wide range of meals and have them delivered directly to your room at any hour. Their model is built around providing affordable lodging, and the extensive infrastructure required for full room service is generally omitted to keep costs down.

Travelodge focuses on providing accessible dining options in its on-site restaurant rather than traditional room service.

Instead of room service, most Travelodge hotels feature an on-site restaurant and bar. This is where guests can enjoy breakfast, lunch, and dinner. The menus are usually designed to offer a selection of popular dishes, catering to a broad range of tastes at competitive prices. This central dining area serves as the main hub for food and beverages, providing a communal space for guests to eat.

For those seeking a quick bite or a drink outside of main meal times, the hotel bar is usually available. Vending machines offering snacks and beverages might also be present in public areas of the hotel, providing an option for late-night cravings or a quick refreshment. The availability of these vending machines can vary by location.

Regarding other services, most Travelodge hotels provide 24-hour reception, which is invaluable for late arrivals or for assistance at any time during your stay. Staff are generally available to help with check-in, check-out, and any queries you might have about the hotel or the local area. This round-the-clock support ensures a degree of security and convenience for all guests.

Car parking is another service that is important to many travellers. While many Travelodge hotels have their own car park, the availability and any associated charges can differ significantly between locations. Some offer free parking, particularly those in suburban or out-of-town areas. Hotels in city centres or prime locations might have limited parking or operate a paid system, sometimes in conjunction with local authority car parks. It is crucial to check the specific parking arrangements for your chosen Travelodge hotel beforehand, perhaps by consulting the hotel’s dedicated page on the Travelodge website, as a lack of parking can be a significant inconvenience.

Wi-Fi access is widely available in Travelodge hotels, though it is often a paid service. Guests can purchase Wi-Fi access codes, typically for a set duration, allowing them to get online for browsing, emails, or work. The cost and speed of the Wi-Fi can vary, and some locations may offer limited free Wi-Fi in public areas. Always check the current Wi-Fi policy for the hotel you are staying at.

The Travelodge SuperRoom double may offer enhanced amenities within the room itself, such as a better quality kettle and more tea/coffee selection, but it does not introduce a traditional room service menu. The focus remains on efficient service delivery through the hotel’s main dining and reception facilities.

Comparing Travelodge Double Rooms: SuperRoom vs. Standard

For travellers weighing their options within the Travelodge brand, the choice between a standard double room and a SuperRoom double is a common point of consideration. Both offer a comfortable space for two guests, but the SuperRoom is designed to provide an elevated experience with additional amenities and a more refined feel, typically at a higher price point.

The fundamental offering of a standard Travelodge double room includes a comfortable double bed, an en-suite bathroom with a shower, toilet, and basin, a television, and basic furniture such as a desk and wardrobe. It is a functional, clean, and reliable space designed for a good night’s sleep without unnecessary extras, fitting the budget-friendly ethos of the brand.

The Travelodge SuperRoom double provides enhanced comfort and amenities over the standard offering.

A Travelodge SuperRoom double builds upon this foundation by incorporating several premium features. While the bed size remains the same, the bedding is often of higher quality, and the room might feel more modernly decorated. A key upgrade is the bathroom, which typically features a more invigorating rainfall shower, along with a wider selection of quality toiletries and often a better quality hairdryer. These additions contribute to a more pleasant and refreshing experience.

In-room beverage facilities are also a common area of enhancement in SuperRooms. While a standard room might have a basic kettle with limited tea and coffee sachets, a SuperRoom often includes a higher-quality kettle, a broader selection of premium teas, coffees, and sometimes hot chocolate. This caters to guests who appreciate a more extensive choice for their hot drinks.

Furthermore, SuperRooms often boast improved connectivity and convenience features. You might find more accessible power sockets, including USB charging ports, which are invaluable for keeping multiple devices charged simultaneously. Some SuperRooms may also include an iron and ironing board directly in the room, eliminating the need to seek out a communal facility, which is a significant convenience for business travellers or those attending events.

The price difference between a standard double and a SuperRoom double can fluctuate. Generally, expect the SuperRoom to cost a few pounds more per night. The decision of which to book often comes down to personal preference and the specific needs of your stay. If you are on a tight budget or only require a basic place to sleep, the standard double is perfectly adequate. However, if you are celebrating a special occasion, undertaking a business trip where comfort is key, or simply wish to treat yourself to a more comfortable stay, the SuperRoom offers considerable added value.

When comparing, consider what specific upgrades the SuperRoom offers that are important to you. Is it the enhanced shower, the better coffee selection, the USB ports, or the iron? Weigh these against the additional cost. For some, the incremental expense for the SuperRoom is well worth the improved comfort and convenience, making it a popular choice for travellers seeking a little extra from their budget hotel stay. For those looking for specific amenities such as in-room fridges or extensive toiletries, neither room type may fully satisfy these needs, as these are typically found in higher-tier hotels.

Travelodge Accessibility and Family Considerations

Travelodge is committed to providing accommodation that is accessible and accommodating for a wide range of guests, including families and individuals with specific accessibility needs. Understanding these provisions is crucial for ensuring a comfortable and stress-free stay for all travellers.

For guests requiring accessible facilities, Travelodge offers specially adapted rooms. These rooms are designed with features that assist individuals with mobility impairments. Typically, this includes wider doorways for easier access with wheelchairs or mobility aids, sufficient space within the room to manoeuvre, and an adapted en-suite bathroom. These bathrooms often feature grab rails, a raised toilet seat, and a walk-in shower with a seat, ensuring safety and independence.

Travelodge provides accessible rooms designed for comfort and safety for guests with mobility needs.

While the primary bed in an accessible room is often a double bed, confirming the exact configuration and the specific adaptations available at your chosen hotel is always recommended. These accessible rooms are available on a first-come, first-served basis and should be booked in advance to guarantee availability, as they are limited in number. The goal is to ensure that everyone can enjoy a pleasant stay, regardless of their physical requirements.

For families travelling with children, Travelodge offers family rooms, which are distinct from standard double rooms. A family room typically consists of a double bed for the adults and a sofa bed or pull-out beds for children. This configuration allows families to stay together in one room, offering convenience and often a more cost-effective solution than booking separate rooms. The exact setup of family rooms can vary by hotel, so it is advisable to check the specifics of the family room at your intended Travelodge location when booking.

While Travelodge does not typically offer room service or in-room fridges, some hotels may have facilities that can assist families. For instance, if you are travelling with a baby, it is worth contacting the hotel directly to inquire if they can provide a cot or crib. While this is not a standard offering in every room, some hotels may have a limited number available upon request. Similarly, for guests who need to store medication that requires refrigeration, making prior arrangements with the hotel staff is the best approach.

When it comes to dining, the Travelodge breakfast buffet often includes a 'kids eat free' offer when accompanied by a paying adult. This policy significantly reduces the cost of family breakfasts, making it a popular choice for parents. The buffet’s variety also typically appeals to children, with options like cereals, pastries, and fruits alongside the hot food. The on-site restaurants are generally designed to be family-friendly, with ample space and a casual atmosphere.

Considering the Travelodge Bath Spa location, while its primary appeal might be its unique setting, the brand’s commitment to accessibility and family provisions remains consistent across its network. Whether booking a standard double room, a SuperRoom double, or a dedicated family or accessible room, Travelodge aims to meet the diverse needs of its guests through practical and reliable accommodation solutions.