Inov-8 Women's Road-X Extreme 158 Running Shoe 100% Mesh and synthetic Imported Rubber sole Met-Cradle webbing for fit and natural alignment Easy on/off heel pull Contoured heel cup Breathable mesh lining Molded foam insole 1 Arrow Shoc-Zone minimal underfoot protection Ideal for elite runners with strong calf and foot muscles, this minimum drop running shoe helps develop an efficient stride.