Amazon.com : Airhead Big Mable Towable 1-2 Rider Tube for Boating and Water Sports, Heavy Duty Full Nylon Cover with Zipper, EVA Foam Pads, Patented Speed Safety Valve for Inflating & Deflating,
WOW Big Shark 2P Towable Tube
Amazon.com : SportsStuff Big Bertha Towable 1-4 Rider Tube for Boating and Water Sports, Kwik-Connect Tow, Double-Stiched Partial Nylon Cover & Patented Speed Safety Valve for Easy Inflating & Deflating : Waterskiing