Open the device wide enough to slide onto horse’s neck just in front of withers. Slide lower leg up to touch the throat where it enters the breast. Read the number at the top edge of sleeve.

A photo essay.

The breast collar style harness is by far the favored harness style amongst carriage drivers. Fitting of a neck collar is a crucial study and a simple, well-fitted breast collar is by far to be preferred over a poorly fitted neck collar. If you are new to neck collars, plan to do a lot of experimenting, spend some money, and try to find someone knowledgeable who can help you. Fitting breast collars is a simple matter, and one breast collar will fit a great variety of horses.