The insulated Big Agnes Air Core sleeping pad for mummy bags is so light you"ll never tire of carrying it, and so comfortable you may need an alarm clock. PrimaLoft eco insulation is 50 percent recycled, making this 3-season pad a smart choice for comfort and warmth on backpacking and camping trips. Full-length 2.5-Inch thick pad is waterproof and lightweight, and packs down to the size of a nalgene water bottle.