ASICS Gel Kayano 18 GS Running Shoe (Little Kid/Big Kid) 100% Fabric-and-synthetic Synthetic sole Biomorphic Fit Upper Stretch material strategically placed on the upper helps to reduce buckling and the potential for irritation. DuoMax Support System A dual density midsole system positioned to enhance support and stability, positioned sport specifically. Rearfoot and Forefoot GEL Cushioning Systems