A How do I know which dock fender is right for my boat and dock setup? Choosing the right dock fender depends on your boat size and dock structure. If you dock in tight slips or experience frequent wave action, heavy duty dock mounted bumpers are recommended. Slammer Marine’s team can help you choose between piling bumpers, straight-edge bumpers, or modular systems based on your setup. Our products are designed to work with wood, aluminum, and concrete docks.