The comfort mummy fit of this 21degf 6degc rated bag offers room to move while remaining thermally efficient it also features a draft collar and our exclusive welded laminatrade construction soft polyester lining wicks away moisture and lightweight nylon shell repels water full length zipper has double sliders for ventilation details proprietary welded laminatrade construction enhances loft and eliminates cold spots zoned insulation maximizes warmth where its needed most th