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US Box Flexi River Fin - 5 inch
  • US Box Flexi River Fin - 5 inch
  • US Box Flexi River Fin - 5 inch

"Saved my fin box three times on the upper Colorado. A must-have for river SUP!"

Mike R.
US Box Flexi River Fin - 5 inch

US Box Flexi River Fin - 5 inch

£9.99 £14.99 SAVE 33%
Universal Fit
Tool-less Install
Rock-proof
  • Flexible impact-resistant design
  • Shallow water river optimized
  • Universal US Box compatibility
  • Hardware included (screw & nut)
River Proven Quality
Durable Construction
Fast Global Shipping

Product Details

US Box 5 Inch long flexi fin for an inflatable or hard paddle board. 5 inch long, thumb screw and nut included.

This fin is great to use in shallow waters such as rivers etc to reduce the risk of snapping your fin or breaking your fin box on your board. 

Materials + Care

Constructed from high-grade flexible polymer designed to bend upon impact. Rinse with fresh water after use in salt or silty river water to maintain hardware longevity.

Shipping + Returns

Orders ship within 24 hours. We offer a 30-day return policy for unused fins in original packaging.
US Box Flexi River Fin - 5 inch

US Box Flexi River Fin - 5 inch

£14.99
£9.99 SAVE 33%

⚡ RIVER SEASON SALE ENDS IN:

Protect your board before your next trip. Prices rise at midnight!

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Trusted by River Paddlers

See why the US Box Flexi River Fin is essential gear

J

Jason T.

The US Box Flexi River Fin - 5 inch is a total game changer. I used to worry about every rock, now I just glide over them.

E

Emma W.

Perfect fit for my inflatable SUP. The 5-inch length is ideal for the shallow creeks I frequent.

C

Chris B.

No more snapped fins! This flexi fin bends exactly when it needs to. Highly recommend for any river paddler.

L

Liam S.

Great quality. The included thumb screw makes it so easy to install without tools on the fly.

S

Sophia G.

I've hit several submerged logs with this 5-inch fin and it just pops right back into shape. Incredible.

M

Mark V.

Essential for low-water conditions. The US Box Flexi River Fin saved my expensive hard board from a nasty crack.

J

Jason T.

The US Box Flexi River Fin - 5 inch is a total game changer. I used to worry about every rock, now I just glide over them.

E

Emma W.

Perfect fit for my inflatable SUP. The 5-inch length is ideal for the shallow creeks I frequent.

C

Chris B.

No more snapped fins! This flexi fin bends exactly when it needs to. Highly recommend for any river paddler.

L

Liam S.

Great quality. The included thumb screw makes it so easy to install without tools on the fly.

S

Sophia G.

I've hit several submerged logs with this 5-inch fin and it just pops right back into shape. Incredible.

M

Mark V.

Essential for low-water conditions. The US Box Flexi River Fin saved my expensive hard board from a nasty crack.

Impact Resistant

Bends instead of breaking

Universal Fit

Fits all standard US Boxes

Quick Install

Thumb screw included

Expert Approved

Tested in class II rapids

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🔥 Trending in Water Sports

Marcus T. from Austin, TX just upgraded to the Flexi River Fin
2 hours ago
Brenda M. from Vancouver, BC ordered 2 for their river expedition
4 hours ago
Alex P. from Boise, ID bought the 5-inch Flexi Fin
6 hours ago

All Reviews