Pieces of equipment, usually made of iron, attached to each side of the saddle for the riders to place their feet.
The length of the stirrups can vary according to the discipline in which the rider is riding. In dressage, the stirrups are quite long allowing the rider to use his leg aids precisely while sitting in the saddle. In jumping, the stirrups are shortened allowing more freedom of movement to the rider and enabling him to easily switch from a light seat to sitting deep in the saddle.
Related term: Saddle