HO Sports Formula 3 Tube The Formula 3 Towable Tube from HO Sports is a fully covered tube that can accommodate up to three riders. Three people can fit side by side in the secure, cockpit style seats. The squared off back of the Formula 3 makes it stable in the whip while the one piece floor makes inflation and deflation a snap. This tube works equally as well with 1, 2, or 3 riders! Dimensions 85x 80 Up to 3 riders! Secure, cockpit style seats 2-way Boston Valve for quick and easy inflationdef