This mummy sleeping bags has a double layer offset and a differential cut construction to stop the cold spots. It has a flip over hood to allow you to flip your hood inside out where you can have a flat hood or a contovred hood. This slumberjack sleeping bags has easy access drawcords and has barrel lock closures and you can get this in either flat or round to make it easily adjust storm closure or the hood in low light. It comes with a anti- snug zipper for good zipper operation. It has internal collars and baffles in liner to prevent the heat loss around neck and shoulders. This sleeping bag foot box has space where the feet will stay in natural position and has a stuff sack.