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 fibers wick moisture effectively to prevent you feeling clammy. Outdoor users will usually opt for the Mummy version, which stretches to fit any sleeping bag shape. 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 Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works seamlessly with sleeping bags of any shape Sea to Summit Guarantee is offered for the Lifetime of this product