Nike Shox R4 Perforation is a line of Nike Shox R4, which designed with Shox technology, which is developed by Nike and incorporated into several of their flagship athletic shoes. You may notice that there are four Shox columns in the heel, produced from a unique, highly resilient formula that is also used in Formula One racing cars. They are designed to collapse efficiently to control impact; quickly at first, then slowing the foot before returning to their original height through the energy stored in them, helping to propel the foot through the footstrike motion. Nike Shox R4 Perforation is the best choice for runners.