Cross Link Polyethylene

Basic closed-cell foam sleeping pad is a lightweight, durable, and economical option for camping and backpacking; rolls up compactly and is light weight (14 ounces); designed with supportive peaks and heat-trapping valleys in the padding for insulation and comfort; R-Value 2.6; cross-linked polyethylene ensures durability and protection from rocks, and sharp uneven sleeping surfaces; closed-cell foam mattress measures 72 x 20 inches and weighs 14 ounces; made in the USA

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We have this one and like it very much. It keeps you dry and provides insulation. Sometimes we use two, one on top of the other. This pad is waterproof and we prefer this type of pad over the ones that require air.