DESIGN & FUNCTION - Iconoclast Boots feature our patented Double Sling Straps for unparalleled lateral support. With its evenly distributed support to the suspensory branches, Iconoclast is the only boot that truly lifts & cradles the equine leg. Designed to reduce joint interference & restriction, this is the perfect all around boot for all disciplines. Designed to use every day to aid in the prevention of soft tissue damage of the lower legs, our boots will help your horse feel more confident with each step he takes, in & out of the arena. THE ICONOCLAST DIFFERENCE - Iconoclast has absolutely REVOLUTIONIZED equine leg support. Our boots are designed to support & protect the suspensory & sesamoidial regions by providing 360-degree support of the equine leg. Never has this method of support been provided for the equine athlete through a strap on, non-restrictive device. Iconoclast Boots were designed by horse trainers & leading veterinarians who were unsatisfied with the performance of every other equine boot in the marketplace. The equine leg needs support & protection against the daily rigors of extreme physical activities & there has not been a boot that adequately meets both of those demands until now. MEASUREMENT & SIZING CHART - Using a soft measuring tape or string, measure your horse’s fetlock circumference. Be sure to measure both the FRONT & HIND fetlocks as they are often different sizes. Customers regularly order boots in one size for the front legs & a different size for the hind legs. Small: 8.5 - 9.5 in./21.59 - 24.13 centimeters Medium: 9.5 - 10.5 in./24.13 - 26.67 centimeters Large: 10.5 - 11.5 in./26.67 - 29.21 centimeters XL: 11.5 - 12.5 in./29.21 - 31.75 centimeters XXL: 12.5 - 13.5 in./31.75 - 34.29 centimeters APPLICATION - Visit http://youtu.be/NWmTL7hnwPE for application instructions