Free Zilla Men's Training Shoes. The Nike Free Zilla is ideal for the athlete training like a pro. This version on the Free is stronger with more cushion for better response while you put in the work. The upper is formed with a dynamic innersleeve that keeps your foot in one place providing comfort and stability. The midsole is designed to work with your natural foot movement by way of the Nike Free technology combined with a two foam system. The outsole features strategically placed delta nodes to provide optimal traction and durability.