Do the boots rub or chaff?
As with anything new being introduced to the body there needs to be an acclimatization period. This will be different for every horse. Once your horse is used to the boot there will be no rubbing or chaffing and the design of the boot is such that the fit is snug and secure but gentle at the same time. The fit is crucial. Accurate measurements/tracings, appropriate trimming methods, insoles and the air chamber all contribute to a successful fit.