Thermarest Prolite Large Ultralight Sleeping PadAll season self inflating foam sleeping pad for backpacking and camping, ideal for sleeping in summer and shoulder season weather Diagonal cut foam offers more warmth than the typical vertical cut foam with an R value of 2. 4 Expanding foam core is lightweight and compressible for easy packing; pad self inflates and can provide firmer support with a few breaths Suited to backpacking and fast and light excursions, the 1 inch thick mattress is an ultra