Minor wear of soles and lace About this item 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. Ortholite Sockliner - SpevaFoam 45 Lasting - Employs 45 degree full length SpevaFoam 45 lasting material for a soft platform feel and improved comfort. Reflectivity - Contains reflective materials designed to enhance visibility during low light hours. FlyteFoam Propel Technology - ASICS energetic foam formulation that provides supreme bounce thanks to a unique elastomer compound.