The Sea To Summit Breeze Mummy Sleeping Bag Liner features a drawcord base, and the stretch-knit fabric offers incredible freedom of movement. In humid conditions, the blend of 70% polyester Coolmax Ecomade/30% Tencel lyocell material wicks moisture effectively to prevent you from feeling clammy. This mummy-style sleeping bag liner from Sea To Summit comes equipped with Insect Shield, a treatment that repels certain bugs to provide greater confidence. Rest assured you will have a cozy and comfortable sleeping experience wherever you rest your head.Manufacturer model #: A3224. 70% polyester Coolmax Ecomade/30% Tencel lyocell Wicks moisture and prevents you from feeling clammy Insect Shield treatment protects against bugs Stretch-knit fabric lets you move Drawcord base