basic human anatomy The coronet band at the very top of the hoof wall really develops this pigmented (colored) coating of horn which makes up the external wall of the hoof. Though this coating is for safety it generally does not like continual connection with the floor, which could cause it flake and to split away.
The waterline is made up from the coronet and from the wall is corium (the existing structure quickly underneath the surfaces). It's heavier compared to pigmented coating and raises its width, because it gets away and more down from the band. basic human anatomy Unlike the coating, that one is a lot tougher and it is really resilient to make contact with towards the floor so it's for safety and assistance of underneath of the hoof.