I got one for my bug out kit, tested it by sleeping in it with just clothes on in 50 deg weather on top of a full length pad, was pretty warm and a bit sweaty. Certainly not as crinkly as the mylar ones and much more durable. Need to test it with a 3 season bag in really cold weather. Also have an AMK heatsheet blanket which is much smaller and goes in the EDC backpack, should test that sometime too.