Polyform U.S. Fenders

Fenders are cheap insurance for an expensive hull, and Polyform U.S. has set the standard for inflatable vinyl boat fenders for decades. This collection covers the full range, from small fenders for runabouts to big commercial-grade fenders for cruisers and trawlers. Choosing right comes down to size, the right series for how you hang them, and carrying enough.

Size the fender to your boat

Bigger and heavier boats need larger fenders to absorb the load and keep the hull off the dock. As a general rule, plan for at least one inch of fender diameter for every four to five feet of boat length, and step up if you dock in rough water or against pilings. Undersized fenders compress to nothing and let the hull contact the dock, which defeats the purpose.

Twin-eye or center-hole

Polyform F-series fenders have a molded eye at each end, so you hang them with a line through both eyes, which is great for vertical hanging along a hull. G and HTM series fenders use a center rope tube running through the middle, which suits hanging from a single point or rolling along a piling. Pick the series that matches how you tie up.

Carry enough fenders

One fender does not protect a boat. A common guideline is at least three fenders for boats up to the mid-twenties in length, and more as the boat grows, plus a spare or two. You want enough to cover the contact points at the dock and to fend off in a raft-up or lock.

Hang them right

Hang fenders at the waterline where the hull meets the dock, and adjust the height for the tide and the dock face. Vertical hanging works along a flat dock, while horizontal hanging spreads protection against pilings. A fender board over two fenders is the trick for rough pilings.

Inflation and care

Polyform fenders inflate with a needle through the valve to a firm but not rock-hard feel, leaving a little give to absorb shock. Rinse them to keep the vinyl clean, and top off the air as temperature changes. Choose a color that hides dock scuffs if you dock often.

Materials and storage

Polyform fenders are made from marine-grade vinyl that resists UV, oil, and abrasion common around docks. When the season ends, deflate them partway, coil the lines, and store the fenders in a cool dry place away from direct sun. Proper storage keeps the vinyl supple and extends service life for many seasons.

Not sure what size or how many you need? Tell our crew your boat length and where you dock, and we will match the fender size, series, and count so your hull stays protected.