Reebok - Rebound Grenade Low (Black/Silver) - Men's: Synthetic and full-grain leather upper with injected thermo formed heel/lateral stability support shell. Internalized speed lacing system. Enhanced herringbone traction patterned soles and widened stablized heel with exposed air pockets. Reebok's DMX Rebound technology cushioning system absorbs energy and efficiently retuns it to the athlete.