Sleeping bag liners

Sleeping bag liners for extra warmth

Sleeping bag liners are one of the most underrated pieces of outdoor gear. Small, lightweight and highly versatile, they offer multiple benefits that make them a smart addition to any sleep system. Whether you're camping, backpacking or traveling, a liner can boost comfort, extend the life of your sleeping bag and help regulate temperature. MEC has a fantastic selection of sleeping bag liners to choose from designed by top brands like Sea To Summit, MEC Label and more.

Added insulation

One of the biggest reasons people use liners is to increase insulation. Depending on the material, a liner can add anywhere from 2°C to over 10°C of warmth to your sleeping setup. This is especially useful for shoulder-season trips or unpredictable weather when you need a bit more heat without investing in a new bag. Look for thermal liners made from fleece or insulated synthetic materials for maximum warmth.

Keep your sleeping bag clean

Sleeping bags can be difficult and time-consuming to wash, especially down bags. A liner acts as a barrier between your body and the bag, reducing the buildup of sweat, oils and dirt. It’s much easier to toss a liner into the wash than to clean your entire sleeping bag, helping extend its lifespan and performance.

Frequently asked questions

What does a sleeping bag liner do?

A sleeping bag liner adds a layer of fabric between your body and your sleeping bag. It helps trap extra body heat for added warmth, keeps your sleeping bag cleaner by reducing exposure to sweat and dirt, and can make your sleep setup feel more comfortable. It’s a simple way to upgrade your sleep system without adding much bulk or weight.

How much warmth does a sleeping bag liner add?

The amount of added warmth depends on the material and construction of the liner. Lightweight liners made from silk or polyester can add around 2 to 5°C, while thermal liners made from fleece or insulated materials can add up to 10°C or more. They're especially helpful when camping in variable weather or when your sleeping bag is slightly under-rated for the conditions.

Can I use a sleeping bag liner on its own?

Yes, many people use sleeping bag liners on their own in warm climates or indoor settings like hostels or cabins. They’re breathable and lightweight, making them a great choice for hot weather camping or travel. Some rectangular liners are designed specifically to be used solo, giving you just enough coverage without overheating.

Sleeping bag liner buyer’s guide

Comfort and versatility

Liners come in a variety of fabrics including silk, cotton, synthetic blends and merino wool. Silk and merino options are soft against the skin and ideal for sensitive sleepers, while synthetic or cotton liners are more durable and budget-friendly. Some liners are mummy-shaped to fit snugly inside technical bags while others are rectangular for more room and can double as standalone sleep sheets in hostels or warm-weather camping.

Travel-friendly options

For backpackers or travellers staying in hostels, liners provide a personal layer of clean bedding and a bit of extra warmth or coverage in questionable conditions. They're lightweight and packable, often weighing less than 300 grams and taking up minimal space in your pack.

For more information when it comes to sleeping bags, check out our guide on how to choose one.