Springboost Women's B-Train Action Training Shoe 100% Leather DorsiFlextion Technology U control insole program with three interchangeable insoles Energy Plate for increase range of motion and optimal use of energy Designed specifically for athletes seeking to increase explosive power and strength Insoles made of EVA and PU absorption bean, which allow for increased muscular demand and participate in the overall training effort; the insoles are constructed with arch support and moisture wicking holes.