Camp Plus Self-Inflating Sleeping MatOur super thick Camp Plus Self Inflating Mat with horizontal Delta Cores delivers plus sized comfort and warmth for year round camping. Horizontal Delta coring is a technology pioneered by Sea to Summit. The process removes over 40% of the foam to reduce weight and bulk but does not compromise comfort and durability. Features 4. 3 R Value is warm enough for all but the coldest ground. Plus size shape and three inch thickness provides ultimate comfort.