Ortholite Sock liner: Moisture management (Ortholite is a registered trademark of ATP Manufacturing LLC). Placed in critical areas of the outsole for exceptional durability. 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. Solyte Midsole Material: A lighter weight midsole compound than ASICS' standard EVA and SpEVA. Also features enhanced cushioning and durability. Rear foot GEL Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to midstance.