The Flow is Vew-Do's #1 selling balance board. It's quick, responsive and lots of fun. This is the perfect board for the intermediate to advanced rider. The Flow boasts an hourglass shaped 7-ply maple deck, high density injection molded rail system, environmentally friendly STS traction surface and a solid hardwood angle tapered rock. This uniquely designed deck and rock combo allow for a quick transfer of rotational energy from hips to legs to board. This low impact ride is great for full body conditioning and fun. It will have you carving around the competition in no time. How is this board different from the Zippy? Although the decks are shaped differently both the Flow and Zippy decks have the same overall running length and are similar in performance. The most significant difference in performance is designed around the Rocks (or rollers). The longer Zippy rock is machined with the patented outrigger design which act as "training wheels" when a rider applies toe or heal pressure to the board. The outriggers allow for increased stability when performing maneuvers requiring toe and heal pressure such as turning spinning and tilting. It's the outrigger design that makes the Zippy ideal for beginner to intermediate riders. Conversely the outrigger-less design of the Flow rock allows the rider to achieve greater toe and heal performance at higher angles thereby making the Flow more challenging and performance driven. The Flow is ideal for intermediate to advanced riders.