The one person, partial covered boat tube was invented in 1984 by the Head Designer of WOW. It now has an arrow shaped design rather than a circular one that allows for more stability and control for the rider. Heavy Duty Partial Nylon CoverHeavy-Gauge PVC BladderDouble Webbing Foam Handles with Knuckle GuardsFlat Foam HandlesReinforced Towing SystemSpeed Valve for Fast Inflation and DeflationZippered Valve CoverCustom Designer Pro Am Racing Stripe GraphicHeavy-Duty Arrow Shape Construction for Stability and More Control for the RiderDrain Vent