NIKE Boy's Dual Fusion Hills Mid Boot (GS) leather-and-mesh Imported Nike Dual Fusion Hills Mid(GS) #685621-001 UPPER: Blend of mesh and durable leather with dynamic lacing system. OUTSOLE: Rubber outsole with dual-density foam with a firm Phylon carrier and a soft interior Phylon core that creates a perfect cushioning system. Protective stylish lightweight boot with durable outsole for the outdoor enthusiast.