Sleeping Mats and R values
Some companies give “R-values” for their sleeping mats. At Alpkit we looked into what these values actually mean and what we found was quite surprising.
A quick google gives a definition for R-values of:
"Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area per unit time, ) through it..."
Looking at this it becomes pretty obvious just how useless an R-value is for rating a sleeping mat. Depending on where you're using it the temperatures on each side of the mat will be changing all the time. Over the course of a night the ground will become gradually cooler and then warm up again in the morning. Likewise, any air movement going over the surface of the mat will cause the temperature on the upper side of the mat to change. Also, every time you move in your sleep you'll be heating and cooling different parts of the mat different amounts with your body.
On top of this, R-values aren't all given in one set of measurements. There's a European system, "RSI" which is metric and the RUS which is in imperial units. It's not often though that anyone will say which number they're giving you. Some people might ask what difference these units make, and it turns out it's quite a lot. The conversion factor between the units comes out as:
1RUS = 5.68RSI
That means that you could be looking at two of the exact same mats but one claims to have a R-Value almost six times bigger than the other. That’s why we decided not to get our sleeping mats rated using R-values. We advise getting a sleeping mat based on your needs and experience, not meaningless numbers from expensive pointless tests.
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