Coleman Big Bay 20 Mummy Sleeping Bag 5% Open 76% polyester 24% spandex Comfortable Base Layer Our 76% polyester 24% spandex which are known to the State of California to cause cancer and birth defects or other reproductive harm Coletherm MAX Insulation provides superior heat retention in temperatures as low as 20°F semi sculpted hood helps lock in heat J zipper for ventilating footbox on warmer nights Sleeping bag packs into compressible stuff sack Thermolock draft tube prevents heat loss through the zipper ZipPlow patented zipper design prevents snags so bag is easy to open and close Cozy Foot soft fleece footbox and Comfort Cuff material for softness and protection around the face Dimensions are 32 x 79 in