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Sea to Summit's most popular sleeping bag liner! The ReactorTM is made from 80g/m2 THERMOLITE®— the lightest weight THERMOLITE® fabric available.


THERMOLITE® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable. The ReactorTM adds up to 8°C of warmth to your sleeping bag or can be used alone as a warm weather bag.

Sea to Summit Thermolite Reactor Sleeping Bag Liner

  • Lighter weight, more packable than fleece 

    Mummy shape with a box foot

    Drawcord hood with mini cord lock

    Extends life of sleeping bags by keeping them clean

    Contrasting colour along the top edge makes it easier to find the opening.

    • Packs into its own Ultra-Sil™ stuff sack

    Size: Standard Extra Warmth – Up to 8ºC. Weight 248g

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