Sizing & fit: Majyk Equipe jump boots
Majyk's standard 'Horse' size generally fits horses 15.1h to 16.3h
The rear spine of the tendon boot is 8 ¼" long, excluding the soft liner which extends c. ½" further on each end. Your horse's cannon bones should be long enough to allow the leg to move freely with the boot on. The hind is 5" long excluding the soft liner.
In terms of girth, the tendon will generally fit horses with a cannon bone circumference of 11"-12"' at the front and 12"-13" hind.