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. 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. DuoMax Support System: A dual density midsole system positioned to enhance support and stability, positioned sport specifically. Guidance Line Midsole Technology: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. The black specks on the medial side of the midsole are intentional and identifies a section of the shoe in which a technological feature exists. These black marks are not a defect.