Therm-a-Rest Z Lite Sol Foam Sleeping Pad with Reflective Heat Surface for Camping, Backpacking, Mountaineering, and Trekking Lightweight and compact closed-cell foam camping mattress is a durable, dependable, and economical option for sleeping on the ground Trusted by mountaineers and backpackers for generations, the classic pad features folding accordion-style construction that is compact and easily packable Reflective ThermaCapture coating and heat-trapping dimples capture radiant heat, increasing overall warmth by 20 percent for an extra cozy nights sleep Sleeping pad foam is softer on the top for comfort, and denser on the bottom for extra insulation, durability, and protection from the ground