The new 2" thick super-soft Therm-A-Seat will keep you warm, dry and comfortable a whole lot longer.. All day long. The newest foam which is sandwiched in between the exclusive and patented evazote foam adds an incredible amount of softness for your comfort. At the same time the durable evazote foam outer layers will assure you that the Therm-A-Seat will last you a long, long time.