| Gender | Men , Women |
| Weight | 218 gr |
| Drop | 6 mm |
| Cushion | soft |
| Runner weight | Light , Medium |
| Running gait | Neutral |
| Surface | Road |
| Use | training |
| Pace | Low , Medium |
| Foot | Normal feet |
| Strike | heel |
| Year | 2013 |
More minimalist than the Nike Free 5.0+ and more cushioned than the Nike Free 3.0, the Nike Free 4.0 Men's Running shoes offers the benefits of foot strengthening and flexibility for a more natural stride without sacrificing foot protection and multi-surface traction.
The flex-friendly grooved outsole, made with deep grooves throughout the midsole, enhances a more natural freedom of movement, promotes a more relaxed foot strike transition, and helps maintain stability.
In addition, the Phylite midsole material is strong enough to serve as an outsole, which significantly reduces the weight of the Running shoes.
Unlike the previous version, the upper features oversized mesh panels in the midfoot that increase airflow for improved ventilation.
After realizing that a group of Stanford runners had been training barefoot on the university's golf campo, three of Nike s most innovative and creative employees decided to develop a Running shoes that would provide a way to run as close to barefoot as possible while being lightweight and comfortable, seeking a natural feel. In 2002, they tested a group of men and women using pressure-measuring insoles attached to their feet and high-speed cameras to capture images of the feet in motion.
After 8 years of studying the biomechanical aspects of running without Running shoes, the results provided an in-depth understanding of the natural landing in the foot's motion when executing the stride, as well as the pressure and position of the toes, which gave Nike designers the opportunity to create an unconventional, highly flexible Running shoes from scratch.
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