When ounces count or you’re camping on abrasive rocky terrain that would render your self-inflating mattress useless, the Therm-a-Rest Z-Lite Sleeping Pad is there to lull you to sleep. The accordion-style Z-Lite features an egg-carton pattern that enhances both warmth and comfort, and the pad also works in conjunction with a self-inflating mattress on winter outings or expeditions