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Sea to Summit Coolmax Adaptor Mummy Liner

Sea to Summit Coolmax Adaptor Mummy Liner

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Product details
Official manufacturer description

The Adaptor COOLMAX® sleeping bag liner will help you adapt to varying temperatures and humidity. The washable, knitted COOLMAX® fabric wicks moisture away from your skin, which helps keep you comfortable as temperatures rise and humidity increases, guaranteeing a great night’s sleep. The COOLMAX® Adaptor liner is ideal for use on its own in warm, humid climates, or as a liner inside your sleeping bag as you transition across seasons, and it's great for keeping your sleeping bag clean and hygienic. It's also available in an Insect Shield® version for extra protection in buggy environments.


  • COOLMAX® fabric is made of a soft, stretchy polyester-knit fabric
  • Wicks moisture from your skin, keeping you dry and comfortable in humid conditions
  • Mummy shape features a drawcord to cinch hood around your head. The drawcord channel is contrasting color to make it easier to find in low light conditions.
  • Traveller shape features a built in pillow slip and side openings for easier entry and exit.
  • Easy care – no special soap is needed for washing.
  • Packs into its own Ultra-Sil stuff sack.
One Size
Age Group
Shoulder girth
35 in
Sleeping bag shell
CoolMax polyester
Sleeping bag weight
8.7 oz
Stuff sack size
6 in x 4.5 in
Sea to Summit Coolmax Adaptor Mummy Liner
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Top reviews
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Amy B
Amy B
Verified camping & hiking expert
Reviewed Jul 13, 2022

Super soft and comfortable Coolmax fabric is also moisture wicking and does a great job of keeping your sleeping bag clean! A great material for a variety of climates and easily machine washable. Weighs 8.7oz and packs to 6 x 4.5 in

Gregg Mason
Gregg Mason
Verified camping & hiking expert
Reviewed Jul 13, 2022

Great stand alone option for travel on hot, humid nights or paired with a bag or quilt to add some warmth, comfort and longevity to your sleep system.