The Big Agnes Encampment sleeping bag offers warmth to 15 degrees and protection from moisture with INTEGRITY; Short Staple synthetic insulation with 97% recycled content; feels as warm and soft as down. The Encampment includes the company's popular integrated pad sleeve system which is different than the traditional sleeping bag on top of a sleeping pad. Instead, they unite the two. With Big Agnes, the pad slides into an integrated sleeve on the bottom of the bag, and the top two-thirds of the bag is insulated in the traditional style. When insulation material is compressed under your body, it loses most of its ability to insulate. They eliminate the unnecessary bottom insulation and replace it with a sleeve to accommodate the pad which provides the insulation. Requires a 20 in. wide rectangular pad (sold separately).