Reebok Realflex Optimal GS Running Shoe (Little Kid/Big Kid) 100% Synthetic-and-mesh Rubber sole Breathable mesh upper for comfort and ventilation, with synthetic overlays for support and durability Removable Ortholite foam sockliner accommodates orthotics and enhances comfort 3D Ultralite outsole provides lightweight support for the foot while encouraging a natural footstrike The 76 individual multi-directional flex nodes on the outsole encourage the natural movement of the foot and offer unparalleled flexibility in every step Durable rubber outsole delivers traction