Therm-a-Rest Trail Comfort (Large) Our warmest, most comfortable backpacking mattress. Added Comfort: Extra-thick for increased warmth and comfort. Easy to Carry: Expanded foam reduces weight and pack size. Durable: 150D ripstop polyester offers superior durability. Weight 3lbs. 3oz. Rolled Size26x5.1in. R-Value 5 Thickness 2 in