"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 has a Free-Flow Zip system that helps regular temperatures, and its drawcord-adjustable footbox and shoulder openings add versatility. The drawcord and shoulder openings integrate perfectly with the Free-Flow Zip system in select Sea to Summit sleeping bags. Plus, HeiQ Fresh odor fighting technology helps keep the liner fresh even after extended use. Rest assured, you will have a cozy and comfortable sleeping experience wherever you rest your head.Manufacturer model #: A3221. 70% polyester Coolmax Ecomade/30% Tencel lyocell Wicks moisture and prevents you from feeling clammy Drawcord-adjustable footbox and shoulder openings Free-Flow Zip system helps regular temperatures HeiQ Fresh odor fighting technology Stretch-knit fabric lets you moveSpecs: Size: 78""L x 31.5""W Packed size: 5.9""L x 2.8""W x 4.3""D Fits to Height: 70"" Weight: 9.5 oz."