Head Radical Pro II Men's Tennis Shoe - Black/Silver Integrated in the midsole heel area, the HEAD Vi-Pod Technology absorbs the energy of impact and distributes it to the entire foot, eliminating vibration and maximizing forward motion. Strategically placed between the heel and forefoot area, the HEAD Energy Bridge provides torsion stability and increased transfer of power from the heel to the forefoot. Integrated in the outer forefoot area, HEAD Lateral Control is a squared edge of harder rubber that provides optimum lateral stability and enables quick changes in direction. Cushioning technology consisting of a unique interlocking coil structure encapsulated within a resilient polyurethane form. A high abrasion compound rubber formula specifically designed for the high stress areas of the tennis soles.