Manmade,Mesh Imported Rubber sole 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. 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 Midsole Technology – Our FlyteFoam technology provides exceptional bounce back and responsiveness no matter the distance, utilizing organic super fibers to help reduce packing out that traditionally happens with softer, low density foams. SpevaFoam Midsole Material – Improves bounce back characteristics and decreases midsole breakdown.