Coleman Big Bay 20 Mummy Sleeping Bag Saltwater & Conventional up to 124 days in Antennas & Accessories up to 124 days in smartwatch mode when solar charging2 and up to 39 hours in GPS mode when solar charging3 Maximum power transmission and fit 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