SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company
SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company
SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company
SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company
SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company

SUP Classic Fin - US-Box

Regular price €29,95 Tax included.
Unit price per
Free shipping available – rates vary by country
● Delivery in 2–8 business days
  • Made in Germany
  • Recycled Materials
  • 1% for the Planet
  • Designed by Surfers
  • 30-Day Returns

The Classic SUP Fin – US Box is a reliable paddle board replacement fin designed for stability, smooth tracking, and easy installation. Whether you lost your original fin or want a dependable spare, this US-Box SUP fin keeps your paddle board moving straight and efficiently on lakes, rivers, and calm coastal waters.

This classic SUP center fin provides the balanced glide and control paddlers need for everyday touring and all-round paddling.

Made from durable fiberglass-reinforced recycled material, the fin delivers long-lasting performance while supporting a more sustainable approach to water sports.

Universal US-Box Compatibility

This paddle board fin replacement fits most boards with the standard US-Box fin system, one of the most widely used center fin systems for SUP and surfboards.

Compatible with many paddle boards including brands such as:

  • Red Paddle Co
  • Fanatic
  • JP Australia
  • Starboard
  • many inflatable and hard paddle boards with a US fin box

If your board uses a US-Box fin with screw and plate, this fin will fit.

Perfect For

  • Replacing a lost paddle board fin
  • All-round SUP paddling and touring
  • Inflatable and hard boards with US-Box fin systems
  • Beginners looking for a stable and reliable SUP center fin
Features
  • Fin Size: 9.0"
  • Fin Type: US-Box
  • Fin Set Type: Single Fin (1 Fin)
  • Color:
Why Choose Our Fins?
  • Made in Germany – precision engineering for reliable SUP performance
  • Durable & High-Performance – built for rivers, lakes, and touring adventures
  • Eco-Friendly – crafted from recycled materials
  • Protecting Our Waters – proud partner of 1% for the Planet

Ride sustainably with Eisbach Riders SUP fins — designed for paddlers who value performance, durability, and eco-friendly materials.

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?

Scroll left to right  SUP Fin Classic - US - Box Single Fin - Eisbach Riders Surfing Company SUP Fin Touring - US - Box Single Fin - Eisbach Riders Surfing Company SUP Fin River Touring - Flexible US - Box Single Fin - Eisbach Riders Surfing Company
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.

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