Fluid ride fluid ride provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durabilityRear foot and forefoot gel cushioning systems attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycleFluid fit Asics fluid fit upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fitHeel clutching system exoskeletal heel counter provides improved support and creates improved heel fitting environmentSeamless construction the use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams