Sevylor Sharkglide towables are made from an innovative material that emulates shark skin, allowing it to move faster in the water, reduce drag, dry faster, and fold away smaller. Sharkglide Skin is extra-durable, lightweight, and less abrasive. The Sharkglide Monster Tube is a 4-person towable made for fast-moving fun on the water. It measures 78" in diameter and is constructed of rugged 30-gauge PVC. The Monster Tube features eight handles for easy gripping, with neoprene knuckle guards and an inflated floor for your comfort and protection. A patent-pending heavy-duty tow system provides extra security. Double Lock and Mini Double Lock valves guarantee a leak-free inflatable.