Why Not Zer0 4?
Why Not Zer0 4? Zer0. 4, the first to feature double-stacked Zoom in the forefoot. It’s an extra-responsive cushioning system that’s designed to help him transform his speed into force and focus his attack. 2 stacked Air Zoom units in the forefoot deliver the ultimate responsiveness and cushioning. Why is Zer0 4 not released? UPDATE