The four new Icefall sleeping bags use MicroThermo High Loft for superior insulation and compression. This sits between a nylon ripstop shell and polyester Taffeta lining in a double bottom layer and a shingle construction upper that sees overlapping angled layers of insulation prevent cold spots by providing secure positioning and uniform loft – extra insulation is added to the footbox. The new thermocollar is contoured for a snug fit over the shoulders and is just one Icefall feature that defines use for demanding conditions.