PRODUCT DETAILSUtilizes Delta Core-V technology, which keeps body contact areas warmer while still offering great support and packabilityMulti-function, patent-pending multi function valve twists over to allow the mat to be rolled tightly without fighting re-inflation as you goAt 1 inch thick and an equivalent R-Value of 2.6, the Ultralight SI Mat delivers a great weight to warmth ratio for minimalist hikers