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The Cocoon MummyLiner CoolMax is a unisex sleeping bag liner made for adding moisture management and a washable next-to-skin layer inside a mummy sleeping bag. CoolMax EcoMade polyester is designed to move moisture away from the body and dry quickly, making this liner useful in warm conditions or as a cleanliness layer on multi-day trips. The mummy shape follows tapered sleeping bags without excess fabric, and the lightweight liner packs down easily for travel, hut trips, bikepacking, or camping. It is intended as a straightforward, serviceable component that fits naturally into a well-sorted setup, with compatibility and installation details worth confirming before use.