Most jockeys are not much taller than 5 feet 3 inches. Some are several inches taller, but they must be quite slim in order to meet stringent weight requirements placed on professional jockeys. Height also affects how aerodynamic jockeys are in the saddle, with smaller jockeys generating less wind resistance.
Many professional racing associations state that jockeys must weigh no more than 126 pounds with all their equipment, which means that they usually weigh around 110 pounds without their gear. The shorter a jockey is, the easier it is to meet this weight limit; however, there are no official limits placed on height.