Start with your boat’s length, then choose fenders for the hull’s contact points and the conditions at your berth. Length charts are a starting point, not a guarantee: an exposed slip, pilings, tidal movement, rafting, or a concrete lock can call for a different fender shape, size, or arrangement.
How to choose the right fender size
Use the manufacturer’s chart for the fender model you are considering. Polyform’s chart maps boat-length ranges to several possible models and separates applications such as protected and unprotected moorings, pilings, rafting, and locks or concrete. Taylor Made describes its Hull-Gard sizing chart as a minimum recommendation and advises checking with your marina and docking neighbors about local conditions.
Then check whether the fender will cover the part of your hull that is likely to meet the dock. Consider the hull’s freeboard and shape, the height of the dock or piling, and how much stand-off the fender provides. Diameter and length both matter: a longer fender covers more vertical hull, while a larger diameter can provide more separation from the dock. These are selection considerations, not a universal sizing formula.
Examples from manufacturer charts
The dimensions below are examples from the named manufacturers, not interchangeable cross-brand recommendations. Confirm the current chart and the selected model before buying.
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- PERMANENT BOAT & DOCK PROTECTION: These permanent boat bumpers mount directly to your dock edge, creating a reliable, continuous barrier that protects your boat hull and dock structure from costly collision damage in any tide or current
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- EASY 3-STEP INSTALLATION: Our dock guards have all been pre-inflated and you can inflate the pier bumpers using a standard needle valve (air pump and needles not included), position them on your dock edge, and secure them with the provided screws
- UNIVERSAL FIT & SIZING GUIDE: Measuring exactly 15.4 inches x 6.5 inches x 5.3 inches inflated, these marine bumpers fit on most normal docks. We recommend 2 pieces for docks line under 10 feet, 3-4 pieces for 10-30 feet, 5-6 pieces for 30-50 feet, and 6+ pieces for over 50 feet
| Manufacturer and product family | Boat-length range on chart | Example fender size |
|---|---|---|
| Taylor Made Hull-Gard | 10–15 feet | 4.5 × 16 inches |
| Taylor Made Hull-Gard | 15–20 feet | 5.5 × 20 inches |
| Taylor Made Hull-Gard | 20–25 feet | 6.5 × 23 inches |
| Taylor Made Hull-Gard | 35–50 feet | 8.5 × 27 inches |
| Taylor Made Hull-Gard | 35–50 feet | 10.5 × 30 inches |
| Taylor Made Tuff End, a separate heavy-duty product family | Up to 30 feet | 6 × 25 inches |
| Taylor Made Tuff End, a separate heavy-duty product family | 25–40 feet | 8 × 27 inches |
| Taylor Made Tuff End, a separate heavy-duty product family | 40–50 feet | 10 × 30 inches |
| Taylor Made Tuff End, a separate heavy-duty product family | 50–60 feet | 12 × 35 inches |
Polyform lists multiple model choices for each boat-length band; for example, its 20–25-foot band includes F-1, F-02, F-2, F-3, G-4, HTM-1, NF-4, A-1, and LD-1. The applicable model depends on the chart’s intended use as well as length, so do not select from the model names alone.
Match fender shape to the berth
Fender shape and orientation affect where and how protection can be placed. Polyform’s application guidance suggests buoy-shaped A or LD models for rafting and F or HTM options for pilings. It describes the NF as an extra-tough recreational option for higher-stress situations such as locks and tidal areas.
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- Special Design: Sturdy ribs of the dock fender bumper is durable enough to against impact. The round shape helps guide the boat down into the slip and reduce the rubbing.
- Dock Bumper Fender Sizes: The size of the dock fenders is 15.2" x 6" x 4" that fit various docking spaces. The mounting hole is at 6" from the top.
Taylor Made’s Big B has a center rope tube running end to end. Its design allows horizontal hanging, which can be useful around pilings and where tidal changes move the boat relative to the dock. Check the product’s instructions and the geometry of your berth before choosing a mounting orientation.
- Protected slip: Begin with the chart’s protected-mooring guidance and check which part of the hull is likely to contact the dock.
- Exposed berth or strong local movement: Use the unprotected-mooring guidance and consult the marina or neighboring boaters about prevailing conditions.
- Pilings: Consider whether the piling’s shape and contact height call for a fender intended for that use, or a design that can hang horizontally.
- Rafting: Consider buoy-shaped options identified for rafting and arrange coverage for the points where the boats may meet.
- Locks or concrete: Use the applicable chart guidance and consider a model intended for higher-stress contact; do not assume an ordinary slip setup is sufficient.
Position fenders along the likely contact area
Polyform’s baseline for docking is: “Use at least three fenders when docking.” It suggests placing one aft, one at maximum beam, and one fore. Hang them between the hull and dock where contact is likely, and adjust their positions for the boat and berth. This is a baseline, not a guarantee that three will cover every hull or condition. Polyform notes that a buoy-shaped fender can provide more stand-off in some situations. Its guidance does not specify one universal spacing distance between fenders.
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- 【Wide Application】These boat bumpers are ideal for dock, yacht, sailboats, fishing boat, day cruiser, canoe, bass boats,pontoon, etc. boat dock fenders bumpers are 3.8mm thick to help protect against punctures and wear,providing reliable protection in harsh marine environments. for boats 20 to 28 ft, the 6.5-inch fenders is recommended, and for boats between 28 - 38 ft, 8.5-inch fenders for boat is ideal
Attach fenders securely and use suitable line
Polyform recommends tying a fender to a cleat secured to the hull or deck, or to the base of a rail stanchion. It cautions against treating an upper rail as a secure attachment point. Set the line so the fender stays between the hull and the dock at the intended contact point.
Choose line that fits the fender’s ropehold. Polyform recommends at least 3/8-inch line for smaller fenders, increasing diameter with fender and ropehold size up to about 1 inch depending on the product. Its separate line guide advises using the largest diameter that fits. Line that is too small can concentrate wear at the ropehold; Polyform warns that undersized line can damage it and says it voids the company’s warranty. Polyform recommends nylon for its stretch and softer contact. Its line guide gives approximate line lengths of 8, 9, 11, and 13 feet; these are guide values, not a fit for every boat.
Rank #4
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- 🏆【DOUBLE HOLE DESIGN】Double hole reinforcement moulding can be hung vertically or horizontally. The boat fenders for docking are convenient to install and disassemble to help you protecting the boat flexibly any time.
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- 👍【WIDE APPLICATION】This Boat Fender Bumper is perfect for docks, yachts, sailboats, row boats, ski boats, canoes, pontoons, fishing boats, buoys, etc. Dreizack will provide one-year warranty.
Inflate and store valve-equipped fenders as directed
For Polyform products, the manufacturer specifies an inflation pressure of 2.1 lb/0.15 bar. Follow the instructions for the actual fender in hand rather than applying that figure to another maker’s product. Polyform warns that overinflation can reduce performance, cause premature failure, and void its warranty.
If using Polyform’s method without a pressure gauge, its instructions say to inflate until the walls are fully expanded while retaining about 1/4 inch of depressibility under light hand pressure; the guide also provides circumference checks. Use the model’s actual valve instructions. Polyform says its inflatable products can be deflated, with stated exceptions for some small series, and recommends storing fenders out of direct sunlight.
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Best Value
- Add Protection Both Boat and Dock: Install the inflatable dock bumper fender on the side of the dock to protect the dock from being hit by boats and protect the boat from damage caused by contact with docks.
- Durable & Reliable Dock Bumper Fender: Constructed from marine grade rotomolded vinyl with sturdy ribs, featuring soft, tough, UV-resistant, impact-resistant and anti-tear to ensuring long-lasting protection for the boat and dock. The included mounting hardware are made of 304 stainless steel for rust-proof and long-lasting.
- Hassle-Free Mounting: Dock bumper fender comes with 304 stainless screws and washers. Provide the convenience of permanently mounting dock bumpers and secure attachment to your dock. No need to adjust fenders each time when docking.
- Special Design: Sturdy ribs of the dock fender bumper is durable enough to against impact. The round shape helps guide the boat down into the slip and reduce the rubbing.
- Dock Bumper Fender Sizes: The size of the dock fenders is 15.2" x 6" x 4" that fit various docking spaces. The mounting hole is at 6" from the top.
Check these details before buying
- Boat length and the model-specific chart recommendation.
- Hull freeboard, likely contact points, and the fender’s diameter and length.
- Berth exposure and whether the setup involves pilings, rafting, tidal movement, or locks and concrete.
- Whether the fender is intended to hang vertically or horizontally and whether its ropehold suits your attachment point.
- Available storage space and, for valve-equipped models, the model’s inflation and care requirements.
- Local advice: Taylor Made says its chart is a minimum recommendation and suggests consulting the marina and docking neighbors about prevailing conditions.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
