Herbie Murray
Sleeping bag liners are an essential item for camping, backpacking, and hiking. They are designed to slip inside your sleeping bag, providing additional warmth and comfort. The warmest sleeping bag liner on the market is the Sea to Summit Reactor Thermolite liner, which can add up to 14-15°F of extra warmth to your sleeping bag. It is constructed with hollow-core fibres to trap extra warm air for insulation. The Reactor Extreme is an even warmer version, boosting the warmth of your sleeping bag by up to 25°F. For those seeking a lightweight option, the Thermolite Reactor is a great choice, providing winter-ready warmth without the bulk.
| Characteristics | Values |
|---|---|
| Warmth | 5 to 25°F extra warmth, with the warmest being the Sea to Summit Thermolite Reactor Compact Plus |
| Shape | Rectangular or tapered "mummy" |
| Material | Synthetic, silk, cotton, polyester, fleece |
| Weight | Lightweight for backpacking |
| Price | Synthetic is the least expensive, silk is the most expensive |
| Other features | Machine washable, moisture-wicking, breathable, insect protection |
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What You'll Learn
- The warmest sleeping bag liner is the Sea to Summit Thermolite Reactor Compact Plus
- The Reactor Extreme is another warm liner by Sea to Summit
- Silk liners are the lightest and most expensive liners
- Mummy-shaped liners are designed to slip inside your sleeping bag
- Insulated liners add warmth and dry faster than cotton
The warmest sleeping bag liner is the Sea to Summit Thermolite Reactor Compact Plus
If you're looking for a sleeping bag liner that will keep you warm, the Sea to Summit Thermolite Reactor Compact Plus is a great option. It's made with Thermolite fabric, which is designed to trap in body heat quickly, providing you with plenty of warmth in cold conditions. In fact, it's said to be the warmest sleeping bag liner available, adding up to 14 degrees Celsius to your sleeping system.
The Sea to Summit liner is also a good choice if you're looking for something lightweight. While it does provide extra warmth, it's not too heavy or bulky, so it's easy to pack and carry. The liner also has excellent stretch, ensuring a comfortable fit and freedom of movement. It's designed to fit any sleeping bag, regardless of shape, and comes in two styles: the classic Mummy and the Mummy with Drawcord, which offers more ventilation options.
The Thermolite fabric used in the Sea to Summit liner is made with hollow-core fibres and infrared-absorbing ceramic pigments. This technology reflects your body heat back to you, enhancing warmth and comfort. The liner also features Sea to Summit's odour control technology, HeiQ Fresh FFL, which neutralizes body odour using a bio-based Amino Sugar Polymer.
The Sea to Summit Thermolite Reactor Compact Plus is an excellent choice if you're seeking a warm and lightweight sleeping bag liner that won't weigh you down on your adventures. It's a versatile and comfortable option, ensuring you stay cosy on chilly nights.
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The Reactor Extreme is another warm liner by Sea to Summit
The Reactor Extreme liner uses Thermolite Pro fabric and infra-red absorbing ceramic pigments to give your sleep system a thermal boost in cold weather. The liner's soft, wicking stretch-knit fabric provides comfort and freedom of movement, and it can fit any sleeping bag. The drawcord footbox offers ventilation and the ability to walk around camp while wearing the liner.
The Reactor Extreme is a good option for those wanting a warm liner that can add an extra season to their sleeping bag setup. It can be used in colder backpacking conditions when serious warmth is needed. However, it is worth noting that some users have found that the warmth it provides falls short of the manufacturer's claims.
The Reactor Extreme is also available in a Compact Plus version, which is said to be the warmest sleeping bag liner on the market. This liner can add up to 14 degrees of warmth to a sleeping system and weighs less than many comparable liners. It is a good option for those needing warmth above all else.
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Silk liners are the lightest and most expensive liners
Silk sleeping bag liners are the lightest option available on the market. They are also breathable and comfortable. However, they are the most expensive liners. They are usually handmade and can be used as a liner in a standard-sized sleeping bag or as a travel sheet/sleep sack. They are also easy to pack with your gear. Silk liners are available in a variety of colours and sizes. The regular-sized liners are 86.5 inches long and 89 cm wide and weigh 4.2 oz, while the extra-large liners are 86.5 inches long and 45 inches wide, weighing 6.5 oz.
Silk liners are perfect for backpackers or travellers who sleep in hostels as they are lightweight and easy to pack. They can also be used on their own in hot climates. Silk liners provide an extra layer of comfort and protection from dirt, bacteria, and wear and tear, thereby extending the life of your sleeping bag.
While silk liners are the most expensive option, synthetic liners are the least expensive. Synthetic liners are also moisture-wicking and breathable, making them ideal for humid conditions. They offer some stretch, which is nice for restless sleepers. Insulated liners, on the other hand, add up to 25°F of warmth, allowing you to extend the range of a lightweight bag. They dry faster than cotton and are moderately priced.
If you are looking for the warmest sleeping bag liner, the Sea to Summit Thermolite Reactor Compact Plus is the one to go for. It adds up to 14 degrees to your sleeping system, although it does come with some extra bulk. The Thermolite Reactor is also a good option as it is lightweight and traps body heat fast, providing winter-ready warmth without too much bulk.
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Mummy-shaped liners are designed to slip inside your sleeping bag
Mummy-shaped sleeping bag liners are designed to slip inside your sleeping bag, helping to keep it free from dirt and body oils. This means your sleeping bag stays clean and requires less frequent laundering, which prolongs its lifespan. Mummy-shaped liners also provide extra warmth, with some models designed for extremely cold conditions adding up to 20 degrees of warmth. The exact amount of warmth provided depends on the liner material, with silk liners weighing the least and liners with higher temperature ratings weighing more. For example, the Cocoon Silk Mummy Liner can be used on its own in warm climates or inside a sleeping bag to add up to 8.4°F (5.3°C) of warmth.
When choosing a mummy-shaped liner, it is important to match it to the shape of your sleeping bag. If you are backpacking, look for a lightweight liner that packs down small and consider the weight of the liner. For example, a fleece liner will keep you warm but will be heavier and bulkier than a cotton or silk liner. Synthetic materials are a good choice for humid conditions as they are moisture-wicking and breathable, while insulated materials like Thermolite® can add up to 25°F of warmth. If you are camping in bug-infested areas, consider a liner with built-in bug protection, such as the Insect Shield® offered by Sea to Summit.
The Sea to Summit Thermolite Reactor Compact Plus is often cited as the warmest sleeping bag liner on the market, adding up to 15°C of warmth. The liner is made of lightweight, synthetic Thermolite fabric, which traps body heat quickly and provides a comfortable, toasty feeling against the skin. The Reactor Extreme is an even warmer version of the liner, providing even more warmth for cold winter nights. For a budget option, the Sea to Summit Reactor Thermolite liner is a good choice, offering excellent warmth without breaking the bank.
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Insulated liners add warmth and dry faster than cotton
Sleeping bag liners are a great way to add warmth to your sleeping bag, especially in cold weather. They are also useful for keeping your bag clean, which is important as a sleeping bag is usually an expensive investment.
Insulated liners, such as the popular Sea to Summit Reactor Thermolite liner, are a great option for adding warmth. This liner is made with hollow-core fibres to trap extra warm air for insulation, adding up to 14-15°F of warmth. It is also lightweight and quick-drying, making it a good choice for camping. The Reactor Extreme is an even warmer version, adding up to 25°F of warmth, although it is bulkier and heavier.
Another option is the Reactor Fleece Liner, also by Sea to Summit, which is their warmest liner. It is made with hollow-core Thermolite® Pro fibres used in a grid pattern to deliver maximum warmth retention. It also has a mummy shape for maximum thermal efficiency and includes shoulder zippers and a drawcord footbox for additional temperature regulation.
Insulated liners are a good choice compared to cotton as they dry faster—for example, Thermolite dries 50% faster than cotton. Cotton liners are versatile and can be used in hot weather, but they are not the warmest option. Silk liners are also an option, although they provide limited warmth.
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Frequently asked questions
The warmest sleeping bag liner on the market is the Sea to Summit Reactor Thermolite liner, which can add up to 14-15°C to your sleeping system. It is constructed with hollow-core fibres to trap extra warm air for insulation.
The Sea to Summit Reactor Thermolite liner is made of 100% polyester, weighing 248 grams. It is lightweight and can be used as a standalone sleeping bag in warmer weather. It has a mummy shape, which is designed for maximum thermal efficiency, and includes shoulder zippers and a drawcord footbox for temperature regulation.
The Reactor Extreme is a warmer, bulkier, and heavier version of the Sea to Summit Reactor Thermolite liner. It weighs 399 grams and can boost the warmth of your sleeping bag by up to 25°F. The Thermolite Reactor liner is also a good option, adding up to 25°F of warmth to your sleeping bag.
