Durable Fully Enclosed Round Blow Up Stinger Tube For Single Riders * 840 Denier Polyester Outer Cover - Double The Strength Of Other Ski Tubes * Tube Features A Reinforced Tow Point With Heavy Duty Quick Connect * Four Neoprene Knuckle Guards And Deluxe Webbing Handles For Optimal Comfort * Boston Valve For Quick Inflating And Deflating; Convenient And Ideal