The self-inflating Exped MegaMat Duo 10 sleeping pad provides couples with plush camping comfort in any season. Because of its 3.9' thickness and synthetic insulation, the mattress has a year-round worthy R-value of 9.5. A self-inflating, open cell foam core provides a luxurious sleeping base. When you unroll the mattress and open the inflate valve, the foam responds by soaking up air, similar to a sponge absorbing liquid. Once the mattress has inflated, you can use the Exped Mini Pump (included), your mouth, or other Exped pump accessories (sold separately) to top off inflation for a firm sleeping surface or let some air out through the deflate valve for a softer mattress. A soft tricot top provides slip resistance and next-to-skin comfort. High-frequency welded seams and strong lamination provide reliable durability and 3-D construction creates vertical sidewalls that offer amazing comfort. Glues used in sleeping pad construction are often broken down by moisture but Exped's proprietary fabric lamination process creates air tight baffles and prevents moisture build up in the pad from destroying these glues resulting in no loss of air over time. Another stand out feature of the pad is flat valve construction. Separate valves for inflation and deflation offer a high volume of air flow in and out of the pad making inflating and deflating the pad fast and easy. Available in Medium (72' x 41') and Long/Wide (77.6' x 52') size options, each Exped MegaMat Duo 10 includes a stuff sack.