Therm-a-Rest NeoAir Trekker Mattress Patent-pending Triangular Core Matrix construction creates over 100 insulating cells that equalize air distribution for unmatched stability Efficient Warmth: Patent-pending ThermaCapture technology traps radiant heat and over one hundred insulating cells minimize convective heat loss Compact and Light: Manual inflation, advanced materials and fiberless insulation assure the lightest and most compact mattress possible Rugged, 75D polyester bottom and supple, 50D top assure maximum versatility with the durability and comfort to handle a wide range of uses R-Value: 3.0