The Nike Free Zilla Trainer training shoe features a dynamic inner sleeve that keeps the foot snug while the dull pull webbing wraps the foot and keeps it centered on the footbed. Natural motion Nike Free flex technology combined with a two foam system. Cushlon ST provides the comfort, while Phylon™ keeps the platform stable. Solid rubber pods with delta nodes in just the right places to give optimal traction. Solid rubber flex outsole. Wt. 11.4 oz.