ASICS Women's Gel-Kayano 23 Lite-Show Running Shoe 100% Synthetic Imported Synthetic sole Reflectivity: Contains reflective materials designed to enhance visibility during low light hours. 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. FluidRide Midsole: FluidRide provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. FluidFitUpper: 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. Heel Clutching SystemTechnology: Exoskeletal heel counter provides improved support and creates improved heel fitting environment.