Thermarest Luxury Map Mattress - Large Softer: Die-cutting selectively decreases foam density in high-pressure areas. More Supportive: Full-density foams in low-pressure areas provide increased support where it's needed most. Lighter, More Compact: While increasing comfort, an overall decrease in the volume of foam makes it more efficient to pack and carry. Non-Slip Surfaces: Soft, stretch-knit top and tough bottom fabric keep you and your mattress together. Stuff sack included.