5 Reasons Your Boat Fenders Are Letting You Down

Excellent 4.8

"PVC had a good run."

— Kris 05/1/26

1.

They deflate.

You walk down the dock, step aboard, and there it is – your fender pancaked flat against the hull. At some point it just let go. Now you're pumping it up dockside like it's a pool toy. Where was that pump again?

This isn't bad luck. It's just how inflatable fenders work. PVC has valves, and valves crack and then leak. CANNON is closed-cell foam. No air inside means nothing to lose — same protection on day one as day one thousand.

2.

Nothing’s changed.

The round pendant fender has been around since the 1950s. Polyform. Taylor Made. PVC and a valve. Nobody really questioned it — it was just the thing you grabbed off the peg at the marina because that's what everyone uses.

CANNON is what happens when someone finally decides that's not good enough. Same classic round shape. Better in every way that actually matters.

3.

You're retying them every time.

Different dock, different height. With a traditional fender you're committed the moment you hang it — and if the height's off, you're starting over.

CANNON attaches anywhere with a soft shackle that goes intuitively around any cleat or rail. No rigging, no fussing. And once it's on, DREADKNOT lets you slide to exactly the right height on the fly. Just slide it and you’re done. You’re locked in.

4.

They're marking up your hull.

It's on the side. That gray smear right where the fender sits — dull, flat, won't buff out. You try not to let it bother you, but it does.

It's the fender. Traditional PVC transfers onto your hull over time, and it gets worse as the fender ages. You hit it with compound. It gets a little better. Never fully goes away.

CANNON is non-marking foam. It makes contact with your hull the way a fender should — and leaves nothing behind.

5.

They’re an afterthought.

Every piece of gear on your boat was a choice. The rod holders, the anchor, the cooler — at some point you thought about each one and picked what you actually wanted. Then you got to fenders and grabbed the cheapest round ones on the peg because they all seemed fine.

They're not. CANNON is the round fender for the boater who's particular about everything else. Buy it once, use it for years, and never think about your fenders again.

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Stop fighting with knots and scuffing your hull. CANNON is built from premium non-marking foam — and with DREADKNOT technology, setting your height takes one slide.

I like gear that doesn’t need babysitting, and this is exactly that. Took a few seconds to set up and I haven’t touched it since. It just works the way you expect it to.

Lee H.

“SOLID. NO NONSENSE.”

“First fender that actually gets it right.”

Roger M.

“SET IT. DONE.”

First thing you notice is how solid it feels. No air, no soft spots, nothing to mess with. Just works every time you pull in.

Dustin R.

Every CANNON fender comes with an integrated DREADKNOT Fender Line attached at the top. Built into that line is the Slide Lock — a tension-based system that lets you adjust fender height with a simple slide up or down. It's always locked in place while remaining easy to reposition, so you never need to tie a clove hitch or any knot to secure your fender. At the end of the line is a soft shackle — loop it around any cleat or attachment point, close the button knot, and it's secure. No hardware to break. Just smart, simple tension and loop technology that's been reliable for generations. Already have fenders you love? MISSION also sells DREADKNOT Fender Lines separately — a simple way to bring the same knot-free adjustment to any fender in your kit.

Traditional pendant fenders are made from inflatable PVC — they mark gelcoat, rely on needle valves that eventually fail, and require knots for every height adjustment. CANNON is built from MISSION's premium closed-cell foam, so it never deflates, never marks your hull, and adjusts height in seconds with DREADKNOT. Same classic round pendant shape. Fundamentally better construction.

Yes — particularly for pontoons where MAVEN isn't compatible, CANNON is an excellent solution. Because Pontoons have high railings and clear attachment points, it gives CANNON the clearance it needs to hang and roll naturally at the dock. If your pontoon has standard tube perimeter railing and a lip below the rub rail, MAVEN was purpose-built for that application. Watch: MAVEN vs. CANNON video. But if you prefer to roll your fenders or want a more classic hanging pendant CANNON is a great choice that provides comparable protections for Pontoons.

Yes. Remove the soft shackle from the end of the DREADKNOT Fender Line and attach the Phender Pro hardware directly to the remaining loop. DREADKNOT handles height adjustment from there — no additional hardware or modification required.

CANNON is built from MISSION's patented XL EXTRALIGHT® closed-cell foam — lightweight, non-marking, UV-resistant, and buoyant. It won't absorb water, deflate, or degrade the way traditional vinyl pendant fenders do. No valves, no pump, no failures. Just solid, reliable foam that holds its shape and does its job season after season.

No. CANNON's closed-cell foam is non-marking and softer than traditional PVC — it's made to protect, not damage. The only real risk with any fender is trapped particulates: sand, grit, debris that gets between the fender and hull. Keep your fenders clean and that risk disappears entirely. A quick rinse or wipe-down if they get dirty is all it takes — a dirty, grimy fender is the only fender you should worry about.

Yes. Closed-cell foam doesn't absorb water, so saltwater exposure isn't a concern. Coastal boaters already know the drill — rinse everything down after every outing. Your fenders should join that routine. That's all they need.

Yes. Closed-cell foam is naturally buoyant — CANNON will float if it ever went overboard – but let keep the fenders there on the boat, Captain.

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