The summit 2538xl self inflating mat from multimat is the largest mat in the expedition range that has been designed to offer an incredibly comfortable and reliable mat at altitude and in season 5 conditions the summit 2538xl has a light weight rip stop nylon upper fabric with water repellent coating on the top and a non slip water repellent coating base layer to keep it both dry and warm this five season mat offers a unique wedge profile and warm zone for extra comfort and to offer you the hi