Boat fenders protect your hull from dock damage. They’re cheap insurance for an expensive asset. We compared the 3 most popular fender brands for recreational and commercial boating.
Head-to-Head: 8.5″ x 27″ Cylindrical Fenders
| Feature | Polyform G-5 | Taylor Made Big B | Crannog C85 |
|---|---|---|---|
| Rating | ⭐ 4.7/5 | ⭐ 4.4/5 | ⭐ 4.3/5 |
| Material | Polyvinyl (proprietary) | Heavy-duty vinyl | PVC |
| UV Resistance | Excellent | Good | Fair |
| Inflation Valve | Needle valve | Needle valve | Needle valve |
| Colors | White, Blue, Black, Red | White, Blue, Black | White, Blue |
| Price (each) | $35–$55 | $25–$40 | $15–$25 |
| Origin | ?? Norway | ?? USA | ?? China |
| Warranty | 5-year | 3-year | 1-year |
Brand Reviews
Polyform — The Industry Standard
⭐ 4.7/5 | Norwegian-made Polyform fenders are found on everything from dinghies to superyachts. Their proprietary polyvinyl material is the most UV-resistant in the industry — these fenders last 10+ years in direct sunlight.
What boaters say: “Had my Polyforms for 8 years in Florida sun. Still look great while my neighbor replaces his cheap ones every season.”
Taylor Made — American Favorite
⭐ 4.4/5 | Solid mid-range option from a well-known American marine accessories brand. Good value, widely available at West Marine and other marine retailers.
Crannog — Budget Option
⭐ 4.3/5 | Chinese-made fenders at aggressive prices. Fine for freshwater and occasional use, but UV degradation is a known issue for full-time dock storage.
Recommendation
Saltwater/full-time dock: Polyform — the UV resistance alone justifies the premium. Freshwater/budget: Taylor Made — good quality at a fair price. Temporary/seasonal: Crannog — cheap enough to replace annually.
Ratings from Amazon, West Marine reviews, and boating forums. CargoRigging.com is an independent directory.
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Frequently Asked Questions
What size boat fender do I need?
The rule of thumb is 1 inch of fender diameter per 4-5 feet of boat length. A 20-foot boat needs 4-5 inch diameter fenders, a 30-foot boat needs 6-7 inch, and a 40-foot boat needs 8-10 inch. Always round up if between sizes. For heavy boats or rough docking conditions, increase one size. You need a minimum of 3 fenders per side — bow, midship, and stern — with additional fenders for rafting or exposed marina berths.
Are inflatable or foam-filled fenders better?
Inflatable fenders (like Polyform) are lighter, more affordable, and can be deflated for storage. They offer excellent energy absorption through air compression. Foam-filled fenders never deflate (even if punctured) and are virtually maintenance-free, but they are heavier and more expensive. For recreational boats, inflatable fenders are the standard choice. For commercial vessels, workboats, and permanent dock installations, foam-filled fenders are more durable long-term.
How should I hang boat fenders for optimal protection?
Hang fenders vertically so the widest part contacts the dock or adjacent vessel at the waterline — this is where most contact occurs. Use a cleat hitch or two half hitches for quick adjustment. Position fenders so they hang 1-2 inches above the waterline to account for wave action and wake. For rafting alongside another boat, hang fenders horizontally to protect the widest beam area. Adjust fender height at every tide change if in a tidal marina.