This full length, no-inflation mat weighs only 18 oz but delivers dreamy comfort when used on our Ultralite Cot. The open-cell foam and breathable ripstop nylon cover deliver no-sweat sleeping due to the great air circulation. On cold nights you can add a reflective space blanket inside on the bottom to sleep warm. The Coo Mat is 75" long and the 25" width means it covers the side poles so your arms are cushioned too. Each long edge had five velcro tabs with stick on pieces for the underside of the UltraLite Cot. This keeps the Cool Mat from moving when you toss and turn. The foam is not like the spongy foam found in most cushions. It is industrial filter foam that stays springy, never rots, and does not hold water.