Big Agnes Rapide SL Insulated Sleeping Pad, Long Material Pad fabric: durable, superlight nylon double ripstop Technology Aviation-grade TPU lamination technology provides ultimate weld strength and durability R-Value 4.8 Insulation 2 Layers of ultralight heat reflective film Thickness 4.25″ (11cm) Dimensions 20 x 78″ (50.8 x 198cm) Weight 19 oz (539g)