The Snugpak Thermalon Sleeping Bag Liner is a knitted liner to boost the thermal rating of any sleeping bag. Thermalon is a body hugging knit material that has strong wicking properties to help keep you dry if you start to overheat. Additionally, Thermalon has a soft, wool like feel that gives an instant sense of warmth. Technical Information Weight: 14 oz Packed Size: 9" x 5" Unpacked Size: Length: 65" Shoulder Width: 19" Foot Width: 19"