If you're in the market for the lightest, most compact self-inflating mattress available, then you've just found it. Therm-a-Rest® ProLiteTM Sleeping Pad uses die-cut foam that packs small and weighs nearly nothing, making it an ideal choice for the ultralight backpacker. Diagonal-cut channels in the foam also retains heat better than straight-cut foam found in most other sleeping pads. Self-inflating, expanding core makes for an easy setup after a long hike. Top off the air with just a few breaths for personalized firmness.