Fanatic SUP Fins

SUP fin compatibility guide

Which Fin Fits My Fanatic SUP?

Fanatic has been a fixture in European stand up paddling for years, and more recently some newer product lines have shifted to the Duotone brand — but the fin hardware hasn't changed. Every Fanatic inflatable SUP we track — Ray Air, Fly Air, Falcon Air, Stubby Air and Diamond Air — uses a standard US Box fin. That means a US Box replacement fin from Eisbach Riders fits correctly across the whole range, whether you've got the compact Stubby Air, a Fly Air for all-round paddling, or a Ray Air built for longer tours. Select your exact model below to see which of our US Box fins we'd recommend for it.
Model Fin box Fit
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Frequently asked questions

Is Fanatic the same as Duotone for SUP fins?
Fanatic's newer product lines are branded under Duotone, but the fin box hardware is unchanged — both use the same US Box system, so the same replacement fins fit.
What fin box does the Fanatic Ray Air use?
US Box — the same system used across the whole Fanatic inflatable range, from the compact Stubby Air to the touring-focused Ray Air.
Do Fanatic Diamond Air and Fly Air use the same fin?
They use the same US Box system, but the ideal fin size differs: the Diamond Air is a shorter all-round board, while the Fly Air comes in longer lengths better suited to a touring fin.

Find the right fin

Pick your board's brand and model — we'll check the fin box and show what fits.

Not sure which model you have? See how to identify your fin box →

How the fin finder works

01

Select your board brand

Choose from Red Paddle, Decathlon, Fanatic, Starboard and more.

02

Choose your exact model

We use your model — and model year where necessary — to determine the fin system.

03

Get your compatibility result

We'll show a compatible Eisbach Riders fin when we have one. If we don't, we'll tell you which system to look for instead.

Can't find your SUP?

Our compatibility database is constantly expanding. If your exact board isn't listed, identify your fin box manually or tell us the brand and model.

Identify my fin box →

Tell us which board is missing

How we verify compatibility

Our database maps SUP brands and models to their fin-box systems using manufacturer specifications, product information and compatibility checks where available. Where we cannot confidently verify a fit, the Fin Finder tells you to check rather than recommending a product as an exact match.

Compatibility database last reviewed: August 2026 · 180 board models mapped