Available in both a Mummy version with a drawcord base, and a Rectangular model with a pillow sleeve, the stretch-knit fabric offers incredible freedom of movement. In humid conditions, the blend of 70% Coolmax Ecomade and 30% biobased Tencel Lyocell fibres wick moisture effectively to prevent you feeling clammy. Outdoor users will usually opt for the Mummy version - in especially buggy environments the Insect Shield® treatment repels certain bugs to provide greater confidence. And for those travelling, the Rectangular model has a built-in pillow sleeve that fits an Aeros Pillow perfectly. Rest assured you will have a hygienic sleep environment wherever you rest your head. Features Coolmax fabric technology keeps you dry and comfortable by wicking moisture from the skin TENCEL Lyocell is a USDA-certified fiber, manufactured using an environmentally responsible process and the blended fabric offers luxurious next-to-skin comfort Rectangular shape with standard-size pillow sleeve is perfect for hostels and budget hotels Mummy version has a drawcord footbox for optimal comfort. The drawcord and shoulder openings integrate perfectly with the Free-Flow Zip system in select Sea to Summit sleeping bags. Open the base drawcord, and you can hitch the liner up and walk - perfect for bathroom breaks HeiQ Fresh odour control technology helps keep the liner fresh even after extended use Insect Shield® is a permethrin-based treatment that repels a number of insects. Unlike spray-on/wash-in permethrin, Insect Shield® does not dissipate in contact with air/water/UV and will last through 25 wash cycles Sea to Summit Guarantee is offered for the Lifetime of this product