User Review: Therm-a-Rest RidgeRest
Price Paid: $18
It's cheap and it works, but the bulk is just too much. I have switched to an Ensolight pad, which works just as well but packs down a wee bit smaller. Foam (non-inflatable) pads can always be depended upon, but they are a pain to carry.
In snow, the ridges tend to accumulate condensation. The Ensolight is smooth and sheds the wet stuff.