På "Backcountry" tas bl.a. just de egenskaperna upp. Nedan har du ett citat från just "Backcountry":
http://friends.backcountry.net/m_factor/pad.html
"Insulative qualities of open-cell vs. closed cell pads...
Closed cell foam pads will hold a lot more of your body heat closer to your body than open cell foam pads. As you are sleeping on a closed cell foam pad, your body heats the air inside the cells near your body. When you move, the trapped air stays where it is so your body does not have to reheat those cells each time you move.
With open cell foam pads, your body heats the cells near you body, but when you move, the air in the pad moves around and the warmer air may be pushed out of the area where your body is warming the pad allowing cold air to move in again. You then have to use precious calories to reheat the pad.
Doing this over and over again during the course of the night can mean a lot of calories and a cold night's sleep.
Practical results...
When winter camping on snow, it can be interesting to see the difference in the snow under your tent after you've had two people on different systems sleeping there. A couple of foam pads, and there's likely to still be snow under the area with the pads. Under an open cell pad like a Therm-a-Rest, you are more likely to find ice where the snow melted and refroze. Brr!
Or, you can camp with one of each... a closed cell for thermal efficiency and a Therm-a-Rest for comfort.
Scientific results...
Many manufacturers of sleeping pads will list the Thermal resistance (R-values) of their sleeping pads. At first glance, the self-inflating pads seem to be better or competitive with the closed cell foam pads. But, if you take into account the thickness and weight of the pads, the closed-cell pads are much more insulative."
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