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. Guidance Line Midsole Technology - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Rearfoot and Forefoot GEL Technology Cushioning System - Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Guidance Trusstic System Technology - This Trusstic System Technology integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity. Ortholite X-40 Sockliner - This premium sockliner features higher rebound properties while providing excellent moisture management and a high-level of breathability (Ortholite is a registered trademark of ATP Manufacturing LLC.)