There are two main types of mountain bike shoes; those that work with flat pedals and those that work with a ‘clipless’ system, with the shoe secured to the pedal by means of a cleat. Shoes for flat pedals have hard-wearing uppers and a tough rubber sole designed to offer grip. MTB clipless shoes use smaller metal cleats than road cycling shoes and have lugs on the sole for grip when walking. Look for how flexible the sole is; it should be flexible enough to allow you to walk as well as pedal. Cleat compatibility is important, as ranges aren’t inter-compatible; the cleats you use will mostly depend on the pedals you’re using.