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.


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.


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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