Coleman®’s sleeping bags are all part of a Comfort Smart™ Technology which is designed to keep you warm and comfortable. Features of this design are: Zipplow™ -Plows fabric away from zipper too prevent snags. Fiberlock™ -Prevents insulation from shifting, increasing durability. Thermolock™ -Reduces heat loss through zipper, keeping you warm. Zipper Glide™ - Tailoring allows smooth zipper operation around corner. Roll Control™ -Locks bag into place for easier rolling. Comfort Cuff™ -Surrounds your face with softness. 4 lbs. rated to +30 F Tall Size (33"x77")