Cold-weather camping is easy when you have a Big Bay™ 20° Mummy Sleeping Bag. From treks out for a car camping trip to stargazing nights in the backyard, this sleeping bag’;s Coletherm™ MAX insulation will keep you warm in temps as low as 20°F. Tend to run cold? The semi-sculpted hood and Thermolock™ draft tube helps to lock in heat so you stay comfortable when the temps drop. INSULATED BODY: Coletherm™ MAX Insulation provides superior heat retention in temperatures as low as 20°F, semi-sculpted hood helps lock in heat FOOT VENTILATION: J-zipper lets you air out footbox on warmer nights COMPRESSIBLE STUFF SACK: Makes it easy to quickly pack up and store sleeping bag HEAT RETENTION: Thermolock™ draft tube prevents heat loss through the zipper EASY ZIP: ZipPlow patented zipper design prevents snags so bag is easy to open and close SOFT MATERIAL: Cozy Foot™ soft fleece footbox and Comfort Cuff™ material for softness and protection around the face ROOMY INTERIOR: Dimensions are 32 x 79 in.