ASICS Men's GT-1000 5 GR Running Shoe 100% Synthetic Imported Rubber sole Shaft measures approximately 3.25" from arch mpact Guidance System (I.G.S) (Running) : ASICS design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. Rearfoot and Forefoot GEL Cushioning Systems: Attenuates shock during impact and toe-off phases, and allows movement on multiple planes as the foot transitions through the gait cycle. SpEVA Midsole: Material Improves bounce-back characteristics and decreases midsole breakdown. DuoMax Support System: A dual-density midsole system positioned to enhance support and stability. Guidance Line: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.