Acavallo Arena Safety StirrupThe Acavallo Arena Safety Stirrup give considerable benefits for the rider including strong relief of foot arches, ankles, knees and hips making this a great stirrup for those riders suffering from orthopedic problems. The inner stirrup arm and footplate constructed of continuous integrated metal The stirrup bow is made of aluminum, while the opening arm is made of a special polyamide material The stirrup pad is made of polyamide, too, and the tread