With the Fusion, you get one great sleeping bag and one great air pad, for one great price! The air pad contours to the shape of the sleeping bag and slides into a sleeve on the back of the Desert Pine bag to avoid your pad slipping around. Now wherever your bag goes, your pad can go too! The Desert Pine sleeping bag is made with Techloft insulation. Techloft Insulation consists of multi-hole staple-length micro-denier fibers that have a siliconized finish for maximum insulation, loft, and compactness. The Desert Pine uses a 2-layer offset construction, sometimes called a "bag within a bag." The contoured hood and mummy shape helps seal up your warmth and keep you warmer. We've saved you the hassle of trying to find an air pad that MIGHT work with your sleeping bag... with this combination it's guaranteed to work!