For your classic "stove pipe" style dressage boots.
We recommend that every pair of dressage boots has a pair of these trees in them when not being used. Keeping the ankle stiff and supported will prevent excess wrinkling which can cause zipper fatigue and is the leading case of zipper breaks. In addition, preventing these wrinkles will prevent rubbing and pressure in your ankle area. They will greatly extend the life and look of your boots and you will not need to replace zippers as often!