A closure assembly system for attaching a foot protection to a horn capsule of an animal by means of attachment structure, which may be secured to a horn capsule wall of the horn capsule, and holding structure, which are secured to the foot protection, wherein the foot protection has a sole plate and at least two adaption elements each having at least one leg and a base plate, and wherein each leg is configured to be slidable essentially radially relative to the horn capsule wall by the base plate, which is configured to be slidable in a sole plate recess of the sole plate that is open towards the topside, and wherein each leg has one of the holding structures, each of which is configured to be connectable with the attachment structure in a sheer-resistant and detachable way.