Name: Flexible River SUP Fin – Quick-Lock
Brand: Eisbach Riders
SKU: ER-SFQL-R47-BK
Price: 49.95 EUR
Availability: InStock

Designed for SUP Touring Adventures

Our SUP fins are engineered for the unique demands of touring and shallow-water river paddling. Tested on Bavarian rivers, lakes, and long-distance routes, they deliver the perfect balance of tracking, stability, and glide efficiency — essential for covering more distance with less effort.

Built from recycled, impact-resistant materials, they’re made to protect both your board and your surroundings. In unexpected ground contact, it’s better to have a fin flex or sacrificially give way than crack your fin box or damage your board.

With optimized shapes for straight-line touring and quick maneuverability, our fins help you stay in control whether you’re paddling upstream, navigating currents, or cruising flatwater.

Eisbach Riders Founders with River Surf Fin – Munich

Born in Munich, Proven Everywhere

Born on the Eisbach river in Munich, we’re a small independent team creating sustainable, high-performance gear for river surfers, ocean riders and SUP touring enthusiasts.

We craft our fins from recycled and bio-based materials, supporting cleaner waters and donating a portion of every sale through 1% for the Planet.

Designed and built in Germany, every product is tested and refined on the river, in the ocean, and on long-distance SUP tours—only gear that truly convinces us makes it into the shop.

Which Fin Is Right for You?

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Fin Type	Classic	Touring	River Touring
Material	Reinforced recycled plastic	Reinforced recycled plastic	Flexible impact-resistant polymer
Sizes	9.0" / 23cm	9.4" / 24cm	4.7" / 12cm
Fin System	US-Box \| Quick-Lock	US-Box \| Quick-Lock	US-Box \| Quick-Lock
Tracking Performance	★★★	★★★★★	★★★★
Maneuverability	★★★★	★★★	★★★★★
Shallow-Water Safety
Best Use Case	Allround \| Lakes \| Ocean	Touring \| Lakes	Touring \| River
Skill Level	Beginner → Intermediate	Beginner → Intermediate	Beginner → Intermediate

Join 1,000+ SUP paddlers and surfers

High-performance SUP and surf fins, trusted by riders across Europe.

FAQ

We offer fins for the two most common SUP fin systems:
- US Box
  → Fits most touring boards, inflatable SUPs, and hardboards
  → Tip: Check the length of your fin box — some SUP models use shorter tracks.
- Smartlock / Quick-Lock (same system)
  → Used by brands like Bluefin, Jobe, and many all-round iSUPs.
Note: Slide-In (used by Decathlon, Aqua Marina, etc.) is not compatible with Smartlock/Quick-Lock.
If you’re unsure, send us a photo of your fin box
No — we currently do not offer fins for Slide-In systems.

Slide-In is used by brands like Decathlon and Aqua Marina, and it is not compatible with Smartlock/Quick-Lock or US-Box.
If your board uses Slide-In, our fins won’t fit.
Touring & Beginners → Touring Fin
Best tracking, most stability, ideal for long-distance paddling.
Shallow Rivers → Flexible River Fin
Bends instead of breaking — protects your gear in shallow spots.
All-Round → Classic SUP Fin
Good balance of stability, turning, and ease of use.
Yes. A proper touring fin reduces the side-to-side “zig-zag” by up to 40%, especially on inflatable boards.
Our Touring Fin offers the best tracking performance.
Pro tip: The biggest improvement always comes from refining paddling technique.
For shallow rivers, streams, or pebble banks:

→ Flexible River Fin (bends instead of breaking)
Definitely. Most SUPs come with a very simple stock fin, and upgrading makes a big difference.

You’ll get:
- Better balance
- Straighter glide
- More control in windy conditions
- Improved safety in moving water
Perfect for beginners who want more stability and confidence.
Our 100% recycled plastic fins are significantly stronger and stiffer than standard ABS fins, giving you more stability and a longer lifespan.
Flexible River Fins are built to bend on impact without snapping.
US Box: Yes — screw & plate (included with all fins)
Smartlock / Quick-Lock: No tools required → clicks in
Slide-In: No tools required (we do not have any fins for this system)
Yes — longer, stiffer touring fins offer:
- Better stability
- More straight-line control
- Improved performance in cross-winds
Most noticeable on inflatable SUPs.

We offer fins for the two most common SUP fin systems:
- US Box
  → Fits most touring boards, inflatable SUPs, and hardboards
  → Tip: Check the length of your fin box — some SUP models use shorter tracks.
- Smartlock / Quick-Lock (same system)
  → Used by brands like Bluefin, Jobe, and many all-round iSUPs.
Note: Slide-In (used by Decathlon, Aqua Marina, etc.) is not compatible with Smartlock/Quick-Lock.
If you’re unsure, send us a photo of your fin box
Touring & Beginners → Touring Fin
Best tracking, most stability, ideal for long-distance paddling.
Shallow Rivers → Flexible River Fin
Bends instead of breaking — protects your gear in shallow spots.
All-Round → Classic SUP Fin
Good balance of stability, turning, and ease of use.
For shallow rivers, streams, or pebble banks:

→ Flexible River Fin (bends instead of breaking)
Our 100% recycled plastic fins are significantly stronger and stiffer than standard ABS fins, giving you more stability and a longer lifespan.
Flexible River Fins are built to bend on impact without snapping.
Yes — longer, stiffer touring fins offer:
- Better stability
- More straight-line control
- Improved performance in cross-winds
Most noticeable on inflatable SUPs.

No — we currently do not offer fins for Slide-In systems.

Slide-In is used by brands like Decathlon and Aqua Marina, and it is not compatible with Smartlock/Quick-Lock or US-Box.
If your board uses Slide-In, our fins won’t fit.
Yes. A proper touring fin reduces the side-to-side “zig-zag” by up to 40%, especially on inflatable boards.
Our Touring Fin offers the best tracking performance.
Pro tip: The biggest improvement always comes from refining paddling technique.
Definitely. Most SUPs come with a very simple stock fin, and upgrading makes a big difference.

You’ll get:
- Better balance
- Straighter glide
- More control in windy conditions
- Improved safety in moving water
Perfect for beginners who want more stability and confidence.
US Box: Yes — screw & plate (included with all fins)
Smartlock / Quick-Lock: No tools required → clicks in
Slide-In: No tools required (we do not have any fins for this system)

Brilliant river fin

This fits my rave board perfectly and definitely helps when dealing with shallower spots on the river

Flussflosse

Bin begeistert

Hochwertige und flexible SUP-Flussfinne für vielseitigen Einsatz

Die Eisbach Riders Quick-Lock Flexible SUP Flussfinne ist eine großartige Wahl für Stand Up Paddle Boarder, die sowohl auf Flüssen als auch auf Seen unterwegs sind. Die Größe von 4.7" macht sie ideal für Flachwasser- und Touring-Abenteuer, da sie für zusätzliche Stabilität und Manövrierfähigkeit sorgt. Besonders praktisch ist die Quick-Lock-Technologie, die eine einfache und werkzeuglose Montage ermöglicht, sodass die Finne schnell angebracht oder entfernt werden kann.Dank der flexiblen Konstruktion ist die Finne robust und widerstandsfähig gegenüber Hindernissen wie Felsen oder Seegras, was sie perfekt für anspruchsvolle Bedingungen macht. Die Finne ist Made in Germany, was für hohe Qualität und Langlebigkeit steht.Insgesamt ist die Eisbach Riders SUP-Flussfinne eine ausgezeichnete Wahl für alle, die eine zuverlässige, flexible und einfach zu handhabende Finne für ihre Stand Up Paddle Boards suchen. Perfekt für Touring, Flussfahrten und flaches Wasser.

Tolle Finne zum SUP-Fahren auf der Alster

Da die Alster in Höhe Wellingsbüttel teilweise schon recht flach ist, brauchte ich unbedingt eine Flussfinne.Hier ist eine tolle Flussfinne, die biegsam und flach genug ist, um auch bei niedrigem Wasserstand problemlos durchzukommen, ohne dass man sich Sorgen um die Beschädigung der Finne machen muss.Das Anklicken ans SUP-Board war genauso easy wie bei der Original-Finne. Perfekt.

Sehr gute Fin, hat sich in der Praxis mehr als bewährt!!!

Sehr gute Fin, hat sich in der Praxis mehr als bewährt.

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One SUP Fin for All Adventures: Touring, Rivers, and Open Water

Whether you're touring long-distance on calm lakes, navigating shallow rivers or paddling along the coastline, our SUP fins deliver stable tracking, smooth glide and reliable control. One fin — every adventure.

SUP Fin River Touring - Flexible US - Box Single Fin - Eisbach Riders Surfing Company

SUP Fin River Touring - Flexible Quick - Lock Single Fin - Eisbach Riders Surfing Company

SUP Fin Touring - Quick - Lock Single Fin - Eisbach Riders Surfing Company

Flexible River SUP Fin – Quick-Lock

Compatible Paddle Boards

Perfect For

Designed for SUP Touring Adventures

Born in Munich, Proven Everywhere

Which Fin Is Right for You?

Join 1,000+ SUP paddlers and surfers

FAQ

Customer Reviews

One SUP Fin for All Adventures: Touring, Rivers, and Open Water

Your cart -

Main Page Menu

Compatible Paddle Boards

Perfect For

Designed for SUP Touring Adventures

Born in Munich, Proven Everywhere

Which Fin Is Right for You?

Join 1,000+ SUP paddlers and surfers

FAQ

Will this fin fit my SUP?

Are your fins also available for Slide-In fin systems?

Which fin should I choose for my paddling style?

Does the fin improve tracking (straight-line paddling)?

Is this fin suitable for shallow water?

Are upgraded SUP fins better for beginners?

How durable are these fins?

Do I need tools to install the fin?

Can I use these fins for stability in wind & waves?

Will this fin fit my SUP?

Which fin should I choose for my paddling style?

Is this fin suitable for shallow water?

How durable are these fins?

Can I use these fins for stability in wind & waves?

Are your fins also available for Slide-In fin systems?

Does the fin improve tracking (straight-line paddling)?

Are upgraded SUP fins better for beginners?

Do I need tools to install the fin?

Customer Reviews

One SUP Fin for All Adventures: Touring, Rivers, and Open Water

Your cart -