Heat loss is dramatically reduced with down insulation inside the mat, as demonstrated by EMPA, the Swiss Federal Labaratories for Materials Testing and Research, and field tests by expeditions. The thick cushion of air also provides comfort and smooths out uneven ground. And as down compresses extremely well, Downmats packs smaller than other insulated pad. Two wide mouth valves ensure fast inflation and simple deflation. Just one quarter turn closes the valve. Similar to a sleeping bag, baffles between the mats‘ chambers eliminate cold spots and promote a stable and supportive air cushion. Light foam blocks at the mat‘s ends prevent down from escaping or migrating between chambers. Laminated polyester fabric is both durable and airtight. Top surface of honeycomb textured fabric provides superior slip resistance and comfort next to the skin. Seams and valves are all high-frequency welded (most secure method of fusing fabrics and materials) to ensure mat integrity. Dark colors dry quickly. For use as a pillow, 2 loops at head end can be used to secure the packsack to the mat. Light and warm: The DownMat 7 has a R-Value of 5.9. At about the same weight a standard 2.5 cm selfinflating mat only has a R-Value of 2.5. Further EMPA tests demonstrated that regular mats lose 3x more heat to cold ground than to the air. The conclusion: use a lighter weight sleeping bag with a DownMat to achieve consistent overall comfort, and still reduce weight and bulk! Exped uses only IDFL-certified, 700 in3/oz goose down, treated with Nocar to eliminate the effects of humidity that may reach the mat‘s interior. Dimensions - 7cm thick, 178cm long 52cm wide. Packed dimensions - 19cm x 15cm. R-value (insulation) - 5.9 Weight - 910g (includes sack)