The Airhead Inflatable Towable - Big Dog 6' seams are hot air overlap welded to increase durability. The double reinforced tow harness is equipped with two 316 stainless steel rings and a 316 stainless swivel to prevent twisting and damage to the tow rope. They’re constructed of UV resistant 31 oz. 1000 denier polyester mesh reinforced PVC and equipped with double reinforced seat pads, heavy duty handles with knuckle guards and 3 H style valves.