Synthetic Imported Rubber sole Shaft measures approximately low-top from arch I.G.S (Impact Guidance System) Technology: ASICS design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. FlyteFoam Midsole Technology: insert info here Fluid Ride Midsole: Fluid Ride provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability.