ASICS Women's Gel-Flux 4 Running Shoe 100% Textile/Synthetic Imported Synthetic sole Shaft measures approximately Low-Top" from arch 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. SpEVA Midsole Material: Improves bounce back characteristics and decreases midsole breakdown. Guidance LineMidsole Technology: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Guidance Trusstic SystemTechnology: This Trusstic System integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity. DuraSponge Outsole: A blown AHAR rubber compound for enhanced cushioning and durability in the forefoot.