Unmatched Warmth-to-Weight: Patent-pending, reflective ThermaCapture™ technology traps radiant heat while Triangular Core Matrix™ construction minimizes convective heat loss–all without the bulk, weight or durability issues of down and synthetic fills. Excellent Comfort: 2.5 inches (6.4 cm) of thickness and baffled internal structure provide unrivaled stability and support. Ultra-Packable: Low-bulk materials make the mattress ultra-compact—as small as a water bottle. WingLock™ Valve: Our intuitive and dependable valve maximizes air flow for easier inflation and quicker deflation. Wings toggle for one-way inflation to save breath. Pump sack, stuff sack and repair kit included Therm-a-Rest Neoair Xtherm R Sleeping Mat | GWC