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. FlyteFoam Lyte Technology - ASICS lightest weight midsole formulation that provides continuous cushion thanks to organic nano fibers. FluidFit Upper - 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. 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 Line Midsole Technology - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. 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.) Gender-specific cushioning - Women's models feature a lower-density top layer in the midsole, allowing female athletes to better enjoy the benefits of midsole compression. Seamless Construction - The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams. FlyteFoam Propel Technology - ASICS energetic foam formulation that provides supreme bounce thanks to a unique elastomer compound.