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. FluidRide? Midsole: FluidRide? provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. Rearfoot 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. Guidance Trusstic System??Technology: This Trusstic System? integrates Guidance Line? construction for enhanced gait efficiency while providing midfoot structural integrity.