asics Kids' GEL-KAYANO 17 GS Running Shoe 100% Synthetic and mesh Rubber sole Asymmetrical Lacing Design: An anatomically correct lacing environment that reduces potential for irritation and provides improved comfort and fit. Open Mesh Upper: Provides excellent comfort and breathability. 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: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle.