I've stated often on these forums the main reason I decided to go lightweight was to be able to carry more luxury items. However, with arthritic hips that only get worse with each passing year, I don't consider my sleeping pad a luxury, but a necessity.

Right now I'm using a Pacific Outdoors 3.5" Insul-Mat. I've tried Themarests in several incarnations and none of them are thick enough to keep my hips off the hard ground. At a tad over 22 ounces, it's worth every gram.