OW!! although this mat kept me warm at night (did not feel the icy ground at all), it was almost painful to sleep on. it really took me a while to get used to it. i felt every "ridge" there was. it might've been more pleasant sleeping on the ground. if you can afford it, go for the inflatable therm-a-rests. those are much nicer.

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rei has great service

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therm-a-rest inflatable kind. much nicer, although i tend to slide a bit on it.