5 stars 
It's a simple idea: let your body perform as it wants to perform to develop significant performance benefits. This is the philosophy of Nike Free, shoes that offer the proven benefits of barefoot training.
Allowed their freedom, the toes will flex and grip, setting off a natural chain that exercises muscles normally neglected in traditional footwear. By exercising these muscles, athletes can achieve small performance benefits, adding millimeters to a vertical leap or shaving milliseconds off a race time, while strengthening key stabilizer muscles that help prevent injuries.
The outsoles of Nike Free shoes feature siping (deep slices) and reverse flex grooves to encourage flexion and extension in both directions. With a lightweight seamless upper atop this flexible outsole, Nike Free shoes merge the natural, healthy motion of a b are foot with the protection of traditional footwear.
Perfect for those new to barefoot-style running. Flex grooves in the outsole promote a natural stride while our Dynamic Fit system hugs your foot and enhances stability.
NIKE FREE 4.0
The shoe for people with Free experience. Deep flex grooves offer a more natural stride while the seamless and lightweight upper provides added support.
NIKE FREE 3.0
A number of deep flex grooves makes this our most barefoot-style shoe. The mesh inner sleeve provides a sock-like fit that works in tandem with the lightweight upper.
