INSULATED & ASTM F3340 Rated: Irradiation cross-linked polyethylene foam combined with a dual-density heat reflective film traps body heat and circulates warmth. With a standard tested and insulation rating of 2.1, this foam sleeping pad is proven to keep you warm in the backcountry. MORE COVERAGE: Hexagonal nodes provide 40% more coverage and height from the ground than the traditional egg-shell foam pad design ULTRALIGHT & DURABLE: Ultralight backpackers love foam pads for its lightweight qualities and dependability. Unlike air sleeping pads, foam pads will not deflate giving you a stress-free night's sleep at camp. RESILIENT & COMFORTABLE: Taller nodes provide more support for your back and the closed cell foam offers a nice plush feel. LIFETIME WARRANTY: Backed with a limited lifetime manufacturing warranty from a U.S. company. Featherstone warrants its products will be free from defects in materials and workmanship to the original owner for the lifetime of the product. If a warranty claim is validated, we will repair, replace or refund, at our option, the damaged product.