Over the course of four decades, Jinjiang in China’s southeastern province of  Fujian has been transformed from an inconspicuous county to a sportswear production powerhouse focused on shoe manufacturing. Now the companies based in China’s "shoe capital" have ambitious plans to expand beyond the domestic market and production for international brands. The South China Morning Post travelled to Jinjiang to find out how local brands from Jinjiang are becoming big names in China, poised to take…