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WHAT IS A R-VALUE?
R-Vaule is a measure of thermal resistance used in the building and construction industry and is used by the outdoor gear industry so you can compare the insulation offered by camping mats. Simply a higher R-Value means more insulation and therefore a warmer mat.
Generally the thicker self inflating mat is the more insulation it will provide and the warmer it will be however many mats have some of the foam cut away to make the mat lighter and more compact and that is where the R-value allows you to make an accurate comparison.