Running shoes are perhaps the most important piece of equipment that a runner will carry. With the proper support and cushion, shoes will be able to absorb much of the impact that otherwise would be absorbed by your body, consequently reducing the risk of injuries. Having your running shoes in optimal condition will ensure you get the maximal benefit from them. Running mechanic and foot form, among other factors, makes each runner unique, and react differently to the different shoe options. In general terms, a shoe will perform its best up to 300 miles, or until they start to be visibly worn, whichever is first.