I just tried out my new $6 WalMart sleeping pad. It was hard as a rock! It may insulate, but provides no cushioning and is really bulky. I cut mine down to 3/4 length so it weighs 8 oz. Do you have to weigh 200 pounds before it cushions? My friend who also weighs under 120 pounds tried one and had the same problem. The thin more flexible blue pads I got at REI are actually more comfortable and the same weight.