Mega in size, comfort and warmth, MegaMat is the ultimate sleeping mat for campers and overlanders who want a premium, reliable, best-in-class sleep experience. With 4 inches of cored foam for reduced weight and better packability, MegaMat provides a soft sleep surface ideal for side sleepers. Dial in your exact firmness further by using the included Top-Up Pump to add more air or by opening the valve to purge excess air. PRO TIP: It may sound counterintuitive, but if you find that your camping mat is just a little too hard, use the inflate valve to purge excess air. By opening the valve and pressing gently on the one-way flapper, you can release controlled bursts of air to reach the exact firmness you want. If you open the extra-large deflate valve, you may find yourself losing more air than you anticipated and need to top off your mat again. R-Value 8.1 Temperature -40 AdegF Dimensions MW: 72 in x 25.6 x 4 inLW: 77.6 x 25.6 x 4 inLXW: 77.6 in x 30.3 x 4 in Weight MW: 4 lbs 9 ozLW: 5 lbsLXW: 5 lbs 11.5 oz Packed Dimensions MW: 26.5 x 7.9 inLW: 26.4 x 8.7 inLXW: 31.1 x 9.8 in Pump Style Self inflation/Top-Up Pump Includes Sleeping mat, Top-Up Pump, temporary repair kit, SideWinder stuff sack