![]() This will be also be dependent on your sleeping bag, how cold you sleep etc. In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. In simple terms, the higher the R-value, the warmer the mat. You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.
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