ASICS Womens Gel-Cumulus 19 Running Shoe 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. 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 SystemTechnology: This Trusstic System integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity. Guidance LineMidsole Technology: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.