FlyteFoam Midsole Technology Fluid Ride Midsole: Fluid Ride provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. Rear 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 cycle. Fluid Fit Upper: 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 fit. Heel Clutching System Technology: Exoskeletal heel counter provides improved support and creates improved heel fitting environment.