You've probably heard comments that closed cell sleeping mats don't absorb water, but is it true?Intuitively, most people don't trust the sales talk that closed cell foam pads don't absorb water.
|Thermarest Z Lite|
Well what do the gear review websites say? Anything from they don't absorb water at all, to they absorb very little. What is the truth? Well this depends on the quality of the mat you have and how much contact the mat has had with water.
My closed cell foam mat absorbed about 17- 25% of its weight in water, depending upon how I exposed it to the water. Deep submersion along with squeezing absorbed more than a superficial sprinkling from the garden hose
My advice would be to keep your mat inside your pack, where it will not be exposed directly to water, perhaps even using it as a pack liner.
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