Flex Fin – 7.5″ to 9.5″


A classic fin template inspired by Greenough’s 4A fin. A wide base with flex through the tip makes for solid speed and flow through carves and turns.

A perfect go-to single fin for whatever the waves are doing.

This is a handcrafted single fin made from wood, carbon fiber, and bio-resin.

SKU: 002 Categories: ,



This is a classic flex fin based off the Greenough 4-A fin template. It’s a solid fin in any material, but our marine ply construction makes it ultra-light and gives a liveliness to its flex and recoil that you just won’t find in fiberglass and composites.

Perfect as a single or as a 2+1. The Greenough 4A is a tried and tested fin that proves fun in a wide range of waves and surfing styles. A must have in your fin collection.

Available in sizes 7.5″ to 9.5″ – it’s a great choice for a variety of boards – everything from pintails to classic logs. You’re sure to have some fun.

Ours are handcrafted using eco-friendly materials: wood core, carbon fiber, and bio-based epoxy resin.

Flex Fin Specs

7.5″ Flex Fin

  • Depth: 7.5″
  • Base: 5.4″
  • Sweep: 25°
  • Area: 24 in²

8.5″ Flex Fin

  • Depth: 8.5″
  • Base: 6.1″
  • Sweep: 25°
  • Area: 29 in²

9.5″ Flex Fin

  • Depth: 9.5″
  • Base:  6.82″
  • Sweep: 25°
  • Area: 37 in²

Handcrafted with eco-friendly materials in Encinitas, California.

Make sure your fins last as long as possible with these simple care and repair tips.


Additional information


7.5", 8.5", 9.5", 10"




US Longboard Standard Fin Box / Bahne Box


Wood, Bio-Based Epoxy, Carbon Fiber

Backorder Note

Please allow up to 1-2 weeks for shipping if the fin you purchase is listed as back ordered.


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