The Nike Free Socfly oozes simplicity. Like its predecessor, the pioneering 1986 Nike Sock Racer, the Socfly is stripped of unnecessary elements to act as a natural extension of the foot. A Velcro closure replaces laces for easy entry, while a seamless, breathable mesh upper is engineered for comfort and breathability. The iconic flexible Free 3.0, defined by its natural motion siping, works in concert with the foot.
Source: Nike