The warmest sleep mat by Sea To Summit, providing true four-season performance. 

The Ether Light XR PRO features Thermal Core® insulation technology that prevents convective heat loss and internal air movement, resulting in outstanding comfort and warmth in the worst of cold weather conditions. 

At four inches thick, Ether Light XR Air Sprung Cells provides a plush sleeping experience regardless of your sleeping position. 

• 7.4 R-Value is perfect for cold weather adventures. 
• Duel layer Thermal Core® insulation fills the inner space, and includes a film that reflects infra-red radiation 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 XPRESS valve and supplied Airstream Pump/stuff sack. 
• Anti-microbial treatment added to the TPU lamination formula prevents internal mould 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.  

• Dimensions: 183 x 55cm 
• Packed Size: 21 x 12cm 
• Packed Weight:620g 
• Stuff/Pump Sack Weight: 60g 
• Weight: 560g