A side step for a vehicle includes an inner side coupled to or adjacent to a vehicle body, an outer side, a top side, a bottom side, a front end and a rear end, where the front end is adapted to be arranged closer to a front of a vehicle than the rear end. An air guide is provided at one or both of the front end and the rear end, the air guide projects outwardly relative to a central portion of the side step that is spaced from the air guide, and the air guide projects outwardly from one or both of the top side and bottom side, and the air guide is thicker, in a vertical direction, at said one or both of the front end and rear end than is the air guide at a location between the front end and rear end.