Therm-a-Rest Prolite Plus Sleeping Pad New Print All-season self-inflating comfort in a packable and lightweight package. The ProLite Plus mattress combines outstanding all-season warmth with the convenience of self-inflation. U.S. sourced patent-pending diagonal-cut foam delivers more warmth than the more common vertical channels, making it the ideal choice for ski touring, cold weather expeditions and winter camping. Stuff sack included.