Biomorphic Fit - Uses high-tech stretch materials to allow the shoe upper to move with the foot. This mean the foot encounters less friction and fabric bunching during specific moments of the gait cycle. * Forefoot Gel Cushioning - Gives great cushioning to help take the strain off the ball of your foot and make these responsive shoes. * Upper - A combination of mesh and synthetic leather makes this shoe durable and breathable. * Trusstic System - Helps maintain stability and suppport whilst remaining lightweight. * NC Rubber - Very grippy rubber which is non-marking, so it is suitabe for indoor use.