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With the best warmth-to-weight ratio of any sleeping pad that Therm-a-Rest has created, the NeoAir XTherm NXT is our go-to pad for cold and high-elevation camping. The 7. 3 R-value makes this a 4-season pick that prevents the cold ground from sapping our body heat, while the 3-inch thick profile also packs in the comfort. Made for mountaineers, alpinists, and winter campers, the NeoAir XTherm NXT weighs less than a pound and gives us exactly what we need for a sound night of sleep outside.