Coleman Big Bay 20 Mummy Sleeping Bag Saltwater & Conventional Precision CNC machined from aircraft M30 Precision CNC machined from aircraft grade aluminum The grip is machined for good handling and a small slot in the head allows for seamless integration with the Corsa leash (sold separately) 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 Coletherm MAX Insulation provides superior heat retention in temperatures as low as 20°F