Light, compact and affordable, the Exped SIM Comfort 10 Self Inflating Sleeping Pad brings Exped's innovation and quality to this more traditional mat design. The SIM, self inflating mat, is a 4 season sleeping pad that is surprisingly lightweight thanks to air cores in the foam. Exped SIM Comfort mats inflate quickly through Exped's exclusive FlatValves, one each for inflation and for deflation. Laminated polyester fabric is both durable, airtight and humidity resistant Velvety soft tricot fabric top is sinfully comfortable. Thickness: 4 in. R value: 9.5 Size: 78 in. x 26 in. Weight: 75 oz.