Many boat owners search for one fixed answer, but boat fenders do not come in a single universal standard that suits every hull and every berth.
A good docking day usually feels uneventful. The boat comes in smoothly, lines are secured, and nothing scrapes, bangs, or leaves a mark behind.
The first signs of docking wear usually appear in the same places: the slip entrance, the dock edge, the corner, and the posts.
A lot of replacement mistakes happen for one simple reason: people measure only one part of boat fenders, then reorder the wrong size.