Exped downmat 7 pump camping mat 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 mats downmat is unmatched for winter camping and sleeping on snow both low profile valves pat pend