Tough 1 Extreme Vented Sport Boots - BLACK FRONT - ALL SIZES - SMB SMALL - 9.5 inches circumference, 10 inches height and 13 - 14.3 hands MEDIUM - 10.5 inches circumference, 11 inches height and 15 to 15.3 hands LARGE - 11.5 inches circumference, 12 inches height and 16 to 16.3 hands