Sierra Designs Nitro Quilt 35 DegreeOne part blanket, one part sleeping bag, all parts cozy. For thru hikers and ultralighters who prioritize their sleep after a long day or anyone who feels restricted by mummy bags, our ultra lightweight, insulated DriDown Nitro Quilt 35 tips the scale at a scant 1 lb, 6 oz and is the catalyst for a well rested night on the trail. An oversized comforter made from durable nylon ripstop drapes over your upper body and tapers into a traditional bag design