Sizing:X-Small: 22" - 14" (Pony, Foals and Weanlings)
Small: 24" - 14.5" (Yearlings, Morgans and Arabians)
Medium: 25" - 16" (Refined Quarter Horse, Small Thoroughbreds)
Large: 26" - 17" (Thoroughbreds, Standardbreds)
X-Large: 28" - 18.5" (Larger Heads, Warmbloods)
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Note from the Manufacturer: Fabric has a good bit of stretch and is intended to have a snug fit. It should fit like athletic clothing.