The Nike Free Metcon 3 combines the flexibility of a Nike Free sole with the flat, wide heel of the Metcon to keep you fast but stable on your feet from weightlifting to speed drills. Natural Flexibility A Nike Free sole creates flexibility under the toes so you can push off for jumps or agility drills. Reliable Stability The proven flat, wide heel of the Metcon creates a stable base when you' re lifting. Rubber tread is designed to give you traction on all types of gym surfaces. Supportive Comfort Foam cushioning is design to be softer in the middle and firmer around the edges for comfort and stability. The sole wraps up the sides to create support when moving side to side.