
Sleeping bag liners are inserted inside sleeping bags to add extra warmth and prevent dirt and sweat from building up. They are usually made of silk, polyester, cotton, fleece, microfiber, or wool. Silk liners are lightweight and less odour-catching than cotton, but they are more expensive and less durable. Cotton liners are comfortable, while polyester liners are more durable than silk but may be less comfortable. Synthetic liners are moisture-wicking and breathable, making them ideal for humid conditions, while insulated liners add warmth and dry faster than cotton.
| Characteristics | Values |
|---|---|
| Material | Silk, Synthetic, Cotton, Polyester, Wool, Microfiber, Fleece |
| Shape | Mummy, Rectangular |
| Properties | Lightweight, Soft, Easy to Clean, Machine Washable, Warm, Stretchy, Moisture-Wicking, Breathable |
| Benefits | Protection against Insects, Dirt, Sweat, Odour, Contaminated Sheets, Extra Warmth |
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What You'll Learn
- Silk sleeping bag liners are lightweight, odour-resistant, and provide protection against insect bites
- Synthetic liners are moisture-wicking, breathable, and ideal for humid conditions
- Insulated liners add warmth and dry faster than cotton
- Mummy-shaped liners fit inside tapered sleeping bags, providing extra warmth
- Rectangular liners are standalone sheets or inserts for rectangular sleeping bags

Silk sleeping bag liners are lightweight, odour-resistant, and provide protection against insect bites
Sleeping bag liners are a handy item for backpackers and travellers. They come in two main types: mummy-shaped liners, designed to slip inside a sleeping bag, and rectangular liners (or travel sheets), which can be used on their own or inside a rectangular sleeping bag.
Silk sleeping bag liners are a great choice for those seeking a lightweight option. Silk is a natural fabric known for its softness and smoothness, and silk liners are often designed with a tapered shape to fit snugly inside a sleeping bag, providing comfort and insulation without adding bulk. The lightweight nature of silk liners makes them ideal for minimising packing weight, which is especially important for backpackers and hikers who need to carry their gear over long distances.
In addition to being lightweight, silk sleeping bag liners offer odour and
Silk sleeping bag liners are also a hygienic option, as they can be easily laundered, ensuring your sleeping environment remains clean. This is especially advantageous when travelling in areas with questionable bedding cleanliness or the potential presence of bed bugs.
Furthermore, silk liners can provide peace of mind when it comes to insect bites. Some silk liners on the market, such as the Insect Shield® MummyLiner™, feature built-in insect repellent technology. This repellent is EPA-approved and molecularly bonded with Permethrin, offering reliable and long-lasting protection against a variety of pests, including mosquitoes, ticks, ants, flies, fleas, chiggers, and midges. This added layer of protection helps ensure a restful night's sleep, free from the nuisance and potential health risks associated with insect bites.
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$19.99

Synthetic liners are moisture-wicking, breathable, and ideal for humid conditions
Synthetic sleeping bag liners are a great option for those sleeping in humid conditions. They are made from synthetic materials, such as CoolMax®, and are designed to be moisture-wicking and breathable. This means that they can effectively draw moisture away from your body, keeping you dry and comfortable even in humid environments.
The moisture-wicking properties of synthetic liners help to reduce the clammy feeling that can occur when sleeping in warm and humid conditions. This is especially beneficial if your sleeping bag does not have breathable lining fabrics or ventilating zippers. By wicking away moisture, synthetic liners also help to prevent the feeling of evaporative cooling, keeping you warm and comfortable.
In addition to their moisture-wicking capabilities, synthetic liners offer other advantages for restless sleepers. They are typically designed with stretch-knit fabrics that allow for freedom of movement, ensuring you never feel constricted. This makes them a comfortable option for those who toss and turn during the night.
Synthetic liners are also easy to care for and machine washable. However, when washing, it is important to avoid using fabric softeners as they can affect the wicking properties of the liner material. By using a liner, you can reduce the need to frequently wash your sleeping bag, extending its lifespan and maintaining its cleanliness.
Synthetic sleeping bag liners are a versatile option for travellers, backpackers, and hostel sleepers. They can be used on their own in warm weather or inside a sleeping bag for added warmth and protection. Their lightweight and breathable nature makes them ideal for humid conditions, ensuring a comfortable and restful night's sleep.
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Insulated liners add warmth and dry faster than cotton
Insulated liners are a great option for those seeking extra warmth when sleeping outdoors. They are designed to fit inside a sleeping bag, providing a layer of insulation that helps maintain a comfortable temperature during cold nights. These liners use hollow-core fibre insulation, which has the added benefit of drying 50% faster than cotton.
The Reactor series of liners, for example, trap extra insulating air in their hollow-core fibres, boosting the warmth of your sleeping environment. Additionally, they effectively wick moisture, keeping you drier and reducing the clammy feeling that can occur in warm, humid conditions. The Reactor series also offers the Reactor Extreme and Reactor Fleece options, which provide excellent moisture management and ventilation, making them ideal for warm climates.
Another advantage of insulated liners is their compatibility with various sleeping bag shapes. While the Mummy shape is commonly used, as it provides a closer fit for extra warmth, the stretch-knit fabric of the Reactor, Breeze, and Comfort Blend liners allows them to move freely with the user, ensuring a comfortable and unrestricted experience.
When choosing an insulated liner, it's important to consider your specific needs and preferences. For those seeking a lightweight and packable option, silk liners are a strong yet lightweight choice. On the other hand, synthetic liners, such as those made with CoolMax®, offer breathability and moisture-wicking properties, making them ideal for humid conditions.
Insulated liners, with their ability to add warmth and dry faster than cotton, enhance the comfort and functionality of your sleeping bag setup, making them a valuable investment for outdoor enthusiasts.
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Mummy-shaped liners fit inside tapered sleeping bags, providing extra warmth
Mummy-shaped sleeping bag liners are designed to slip inside tapered sleeping bags, providing extra warmth and protecting the bag from dirt and body oils. Mummy sleeping bags are tapered towards the bottom, providing a closer fit than regular sleeping bags, and so liners for these bags should provide extra warmth in winter. Liners can be made from various materials, including silk, polyester, cotton, and synthetic fabrics. Silk liners are strong and lightweight, offering protection against insect bites, but may not last as long as polyester or cotton. Synthetic liners, such as those made with CoolMax®, are moisture-wicking and breathable, making them ideal for humid conditions. Insulated liners, such as those made with Thermolite®, can add up to 25°F of warmth and dry 50% faster than cotton.
Mummy-shaped liners are also available in stretch-knit fabrics, which allow for freedom of movement and are ideal for restless sleepers. Some liners feature treatments such as HeIQ Fresh, a biocide-free amino sugar that neutralizes odours and keeps the liner fresh. A Reactor series liner can add warmth by trapping insulating air in its hollow-core fibres and absorbing infrared radiation. It also wicks moisture, helping to keep you dry. A Breeze series liner wicks moisture even more effectively, reducing the clammy feeling that can occur in warm, humid conditions.
Mummy-shaped liners are a lightweight and compact way to improve the hygiene, comfort, and warmth of your sleeping bag. They are ideal for backpackers and travellers who may not always have access to clean bedding. Liners can be easily removed and washed, improving hygiene and reducing the need to wash the sleeping bag itself, which can extend the life of the bag.
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Rectangular liners are standalone sheets or inserts for rectangular sleeping bags
Rectangular sleeping bag liners are standalone sheets or inserts for rectangular sleeping bags. They are designed to fit inside rectangular sleeping bags, providing extra space to stretch out. This makes them ideal for use in hostels or Alpine huts, where hygiene standards may be questionable. Rectangular liners can also be used as standalone sheets in warm weather, providing a lightweight and compact solution for travellers.
Rectangular bag liners are often made of silk, which is lightweight, strong, and provides protection against insect bites. Silk liners are also less likely to retain odours than cotton alternatives. Other rectangular liners are made from synthetic materials, such as CoolMax®, which are moisture-wicking and breathable, making them suitable for humid conditions. Insulated liners, such as those made with Thermolite®, can add up to 25°F of warmth to a sleeping bag.
Rectangular liners are also available with pillow sleeves, such as the Sea to Summit Breeze and Silk Blend liners. These liners feature stretch-knit fabrics that move freely with the sleeper, providing a comfortable and unrestricted experience. Additionally, the Sea to Summit Silk Blend Liners feature Comfort Stretch Panels for added comfort. All Sea to Summit liners are machine washable and can be washed with standard laundry detergent.
Rectangular sleeping bag liners offer a versatile option for travellers and outdoor enthusiasts, providing a hygienic and comfortable sleeping solution in various conditions. They can be used as standalone sheets or inserts for rectangular sleeping bags, offering warmth, breathability, and protection against insects.
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Frequently asked questions
Sleeping bag liners are typically made of silk, polyester, cotton, fleece, microfiber, or wool.
Silk sleeping bag liners are super strong for their weight, making them lightweight and packable. They also provide protection against insect bites in midge-prone areas. Additionally, silk liners are less odour-catching than cotton, making them feel cleaner and less smelly on multi-day trips.
Yes, synthetic liners made from materials like CoolMax® are moisture-wicking and breathable, making them ideal for humid conditions. They also offer some stretch, which is nice for restless sleepers.











































