A soccer ball, like all sports balls, will compress and store energy on impact, then release that energy. This is called the "trampoline effect" or the "coefficient of restitution". The VICTURY ball is built with KrunchCOR®, a U.S. and international patent-pending construction that dramatically absorbs impact while retaining the shape and physical properties of a sports ball. The ball is engineered to be hit at full-force for indoor and in-home training. Train in any weather, day or night and dominate your sport.