Nike's Shox technology is an advanced impact minimization and cushioning system for your shoe. Similar to standard shocks on vehicles, the purpose of Nike Shox is to slow the rate of impact loading. This reduces your risk of injury, and provides a unique, responsive feel. The system utilizes a resilient foam in the column, an inner spring, and a Pebax dispersion plate. The result is a more controlled impact with each step, as well as increased bounce back.