Description Features 6.3 R-Value is perfect for cold weather adventures. At four inches thick, Ether Light XT Air Sprung Cells provides a plush sleeping experience. Dual-density layers of Thermolite® insulation (higher density than the unisex model) fill the inner space, preventing heat loss due to convection and internal air movement. Lighter, quieter and durable 30D/40D face fabric with Sea to Summit’s liquid-extruded lamination is extremely reliable. Quick and easy inflation, deflation and adjustment is made possible by our multi-function valve and supplied Airstream Pump/stuff sack. Anti-microbial treatment added to the TPU lamination formula prevents internal mold growth. PillowLock system prevents your Sea to Summit Aeros Pillow from slipping. Comes with a stuff sack which doubles as a pump, a repair kit with six self-adhesive patches and a spare valve insert. BEST USE: Cold Weather Backpacking WEIGHT: 1lb 15oz | 870g PERFORMANCE: 4 Season PACKED SIZE: 7.3 x 11in | 18.5 x 28cm