ZERO MATTRESS R05 is a ultralight air sleeping pad with 5.6 R-value for 4-season R05 REGULAR: Weight: 24.3oz (710g) R-Value: 5.6 Size: 72*25.6*2.8in (183*65*7cm) Packed Dimension: f5.1*10.8in (13*27.5cm) Maximum Weight Capacity: 330lb (150kg) R05 MUMMY: Weight: 18.3oz (535g) R-Value: 6 Size: 72*21.6*2.8in (183*55*7cm) Packed Dimension: f5.1*9 in (12.5*23cm) Maximum Weight Capacity: 330lb (150kg)