Trail running is a rapidly emerging running discipline that requires mental and physical endurance. Most of the time, running takes place on unpaved surfaces, with stones, moss and grass. To minimise the risk of lower limb injury, the optimal choice of footwear needs to be well considered before starting training. Data suggests that footwear (insole, outsole and midsole) can play an important role in lower limb injuries. Shoes are usually divided into three main groups: "maximalist", "conventional" and "minimalist" shoes, which are chosen by runners according to their feeling and needs. A thin sole and no heel drop for minimalists; a thicker sole and a heel drop of more than one centimetre for conventional and finally, a usual cushioning of more than thirty centimetres with zero heel drop for maximalists.