Combining TILT ultralight fabric and heat-trapping offset air chamber construction this featherlight air mat offers superb warmth for weight and packability. Highly comfortable it's the ideal foundation for thru-hiking and multi-day mountain runs. Features 2 layers of TILT reflective film help reduce radiant heat loss without adding weight or bulk Offset weight saving internal cut outs help disrupt the flow of convection currents and keep warm air static R-Value: 4.3 Thickness: 8cm Packed size: 18x9cm Tapered mummy shape to save weight Low profile two-way valve for easy inflation and deflation Pump sack included for rapid and hygienic inflation Roll-away stuff sack with repair kit included Materials 20D Recycled Polyester outer fabric with internal TPU Coating and fluorocarbon free DWR 85% Polyester 15% Polyamide Weight 370g / 13.05oz