Don’t let the icy winter night’s keep you from getting a great night’s sleep. The Inferno is designed for maximal thermal efficiency, with a system of baffles that prevent down migration and an aluminum coating to reflect your bodyheat back inwards. The ½ length center zip, hood and multilayer draft collar reduce the places that warm air can escape. And, if you need a little extra insulation, the roomy cut provides room for layers.