BJump Sole (medium Size 8-10) - Jumpsole - Shoes with a Platform to Increase Your Vertical Leap ReviewbP PP Jump Sole (medium Size 8-10) - Jumpsole - Shoes with a Platform to Increase Your Vertical Leap PBuilds fast-twitch muscle fiber in the lower legPIncludes DVD and Training ManualPFun and EffectivePGreat for all sports! Including Football, Basketball, soccer, hockeyPUsed by the Pros and Pro Teams!P