Sit, stand, kneel, ride backward or do a handstand. Its all possible on HO Sports innovative RAD 4. A surefire way for a great time on the water, the 4-foot diameter device has an aquatic hook to hold the rope while starting, and a handle to stabilize you as you stand up. The RAD 4 is so easy to ride; beginners and children will have no problem jumping on. You can tow the RAD 4 behind your boat, float on it in the lake or pool, or tie it to a dock for a relaxing day on the water. HOs creative design allows for multiple riding and playing options. Adventure seekers can spin around to their heart's desire to practice 360s, unlike traditional, directional wakeboards. Built with HO Sports Drop Stitch technology, the RAD 4 inflates to 20PSI for optimum rigidity. Durable Drop Stitch material joins two pieces of sturdy, support fabric together with thousands of fine polyester threads. Each thread is the same length and spaced evenly providing reinforced support. HO applied an air tight coating to the top and bottom of the RAD+ to ensure a strong seal. Finally, the machined EVA traction pads keep you from slipping and sliding while on the water. Whatever adventure you crave, the RAD 4 has you covered. Key Features Easy compact storage Provides a fun, maneuverable ride Tow with any vehicle Innovative design allows you to spin, stand, kneel, sit Any skill level can ride Nylon handle for steering Includes high-pressure hand pump with pressure gage Store in a cool dry place out of sunlight One year warranty covers manufacturer defects in materials and workmanship Handle hook located on the top of the RAD for smooth, hands-free starts Great to get kids used to being pulled behind a boat while holding onto a rope 4 feet in diameter when inflated