You must measure your leg length to find what size English stirrup leathers you need. The average stirrup leather length is 54-inches for a standard-sized rider. Tall riders may need up to 62-inches, and children and small adults usually use 48-inch leathers.  To find the correct size leathers, you must also consider your riding discipline. If you enjoy jumping activities or racing, choose shorter stirrups to help you maneuver more in the saddle. If you take part in dressage, you need longer leathers to help you maintain a deep seat.