The Wild Things Shelter Liner (56" x 80") is made from soft 70 denier nylon treated with NanoSphere® DWR quilted to 2 oz PrimaLoft® Sport synthetic insulation. The Shelter Liner is a lightweight, packable, insulated blanket. Multiple tie-downs allow the Shelter Liner to tie/cinch up around the user. Used in conjunction with our Waterproof Shelter (sold separately), this combination creates a warm and dry emergency shelter system.