(Millennium Equine) Virtually indestructible patented rubber pads. Easily attach to your own stirrups. Guaranteed to stay firmly in place, helping to improve your body and leg position while keeping your feet centered in the stirrups and relieving stress on knees and ankles. Measure your stirrup base, heel to toe. If your base measures 2 1/2" you would purchase 2" pads. Aluminum or wooden stirrups, always purchase next size smaller than actual base size.