Big Agnes Insulated Air Core Pad with PrimaLoft Eco is the first sleeping pad to incorporate one of the outdoor industry's premier insulation materials to provide added warmth. Designed for those seeking an air pad suitable for 3 Season use, these 3.5 inch thick pads share the same I beam construction of the original Air Core pad, but use a lighter, 40 denier fabric. The stuffed size and weight on these pads are still smaller than any self inflating foam pad. This extra wide pad is ideal for the Big Agnes Park Series bags and people who like a larger pad to sleep on. For an excellent night's sleep in the backcountry, try the Award Winning Big Agnes Insulated Air Core Pads. Available in mummy and rectangular cut.