Sea To Summit Camp Plus Self-Inflating Sleeping MatOur super thick Camp Plus Self Inflating. Mat with 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 in delta shaped cores to reduce weight and bulk, but does not compromise on comfort and durability. Our blog post "Which Mat Should I Choose" has some helpful tips on picking the perfect self inflating sleeping mat (or