To avoid accidents, the stirrup should be the right size. This depends on the width of the rider's shoe. The shoe or riding boot should fit easily into the stirrup.
If the stirrup is too narrow, the rider will not be able to get into the stirrup or, in the worst case, will get stuck in it. If a rider does not get out of the stirrup in time during a fall, he may be dragged along by the horse. This can lead to serious injuries.
If the stirrup is too wide, the rider's foot may slip through the stirrup. In this case, too, the rider gets caught in the stirrup in the event of a fall and cannot get out of the stirrup quickly enough.