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if this is a size issue much like selecting a kayak for touring. Would a sleeping mat for a 5' 125# back sleeper work for a 6' 5" 245# side sleeper? Not at all.
A data base of size, position, gender and preferred mat would be a very interesting project.
FWIW, I'm 6' 200# male side sleeper, and I like the Exped Synmat 9LW. Further, I live in a warm climate.
I have a therm a rest prolite large. It is 25 inches wide for my old body and it is full length. It folds in half and rolls into a very small stuff sack - 13" x 4.5" inches and it is quite light. It is one inch thick. I use it for all seasons and weather except the dead of winter. I have used it a lot in the Maine northwoods in the shoulder seasons and in summer. Also used it in Canada on the shield and in the far north on the tundra as well. It has never failed me except one time when we were pinned down over night in an emergency campsite in cold terrible weather on Chesuncook Lake one time and stupidly we were making dinner in the tent (something I never do) and my partner sliced it with a knife. That was an uncomfortable night. I repaired it and it has been fine since. Yes, it has kept me warm and comfortable all over Canada, including on the tundra, including on rocky ground, etc. Guess god was helping me! Highly recommended.
Say what Kayakmedic??? I used a Thermarest Camp Rest for years in Canada. 2" of padding and I usually slept better than @ home. And, I was usually sleeping on rock. Even @ 25" x 6" rolled, I had no problem packing or portaging. I mean c'mon... a canoe has plenty of room, why suffer with a small pad?