I got a piece of foam that was on one of the kids twin bed that is 30"x 80"x 1.5". It has the typical egg carton design on one side and flat on the other. If I trim it up to fit in my DL WBRR, shouldn't it work pretty good. At least until my wife finds out she is getting me a Lynx for Christmas. She just doesn't know it yet. I got a Big Agnes Encampment sleeping bag. I got the air pad for the bag but it just doesn't keep me warm in cooler weather. Works great for summer.