Roughing it doesn't mean you have to do without basic comforts. Designed to meet the needs of backpackers and hikers worldwide, the 3-season Sea to Summit Camp Self-Inflating Sleeping Mat has an impressive ASTM R-value of 4.2. This rugged sleeping mat features a multi-function self-inflation/deflation valve and Delta Core-V foam technology that allows you to fine tune your air pressure. Made from durable 75D polyester with extrusion laminated TPU, the Sea to Summit Camp Self-Inflating Sleeping Mat provides years comfort at a reasonable price.