The Therm-a-Rest ProLite is the lightest and most compact self-inflating mattress available, designed for three-season backcountry adventures. It features a die-cut foam that provides essential warmth and comfort while remaining highly packable for lightweight travel. The mattress is equipped with the high-performance WingLock Valve, which offers three times the airflow rate of the classic valve thanks to a larger opening and one-way inflation. Technical Specifications: R-Value: 2.4; Weight: 510g (1 lb 2 oz); Dimensions: 183 x 51 x 2.5 cm (72 x 20 x 1 in); Packed size: 28 x 15 cm (11 x 5.8 in); Fabric: 50D mini hex polyester; Foam type: Urethane Foam.