I hate to quibble with a Canadian, especially from here in California, but use the foam pad on the ground and the mattress on top, not vice versa. Reason: you don't want the mattress in direct contact with the cold ground/snow, losing heat via convection.

(See the "Pro Tips" in this FAQ)

http://www.cascadedesigns.com/Therm-A-Rest/FAQ

Cheers,


Edited by Rick_D (12/28/10 01:20 AM)
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--Rick