Outsole: Guidance Line®- Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Impact Guidance System (I.G.S.®)- ASICS® design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. Guidance Trusstic System®- This Trusstic System® integrates Guidance Line® construction for enhanced gait efficiency while providing midfoot structural integrity. AHAR®- Acronym for ASICS® High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability. Upper: Heel Clutching System™- Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Discrete Eyelets- Independently placed eyelets disburse lace tension, creating a customized fitting environment and enhanced upper comfort. ComforDry™ Sockliner- Provides cushioning performance and anti-odor properties for a cooler, drier, healthier environment. FluidFit™- ASICS FluidFit™ upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fit. Midsole: FluidRide™- The latest evolution in ASICS midsole technology, FluidRide™ provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. APMA Seal of Acceptance Designated shoes have the use of the American Podiatric Medical Association (APMA) Seal of Acceptance.