"The Hydroslide Pro XLT Kneeboard brings back the proven parabolic shape better than ever. Now with an integrated HydroHook, this Hydroslide kneeboard allows the rider to get up quickly with little effort, while the retractable fin system lets the rider adjust the ride on the fly: extend the fins for more control when charging the wake, or quickly retract them for effortless spins. With this type of functionality, the Pro XLT is a perfect choice for riders of all skill levels. 51.75""L x 21""W. Rotomolded: durable, buoyant, great for learning Cable-actuated retractable fins Parabolic twin-tip design Dual-layer EVA pad with deep knee wells Integrated HydroHook 3"" padded shock strap"