GREENOUGH X BROTHERS MARSHALL 4-A

Introducing a very limited run of Greenough 4-A fins, a special collaboration between True Ames and Brothers Marshall. These hand-made 10" Greenough 4-As, crafted in Carpinteria, California, come in two exclusive signature colors — Teal and Royal Blue. Only a handful exist.

The Greenough 4-A Single Fin is widely regarded as the most iconic, functional, and versatile single fin ever made. Its balanced template delivers exceptional drive, smooth release, and reliable hold, making it a perfect match for nearly every type of surfboard. For over 40 years, the 4-A has been the cornerstone of the True Ames lineup and remains the most sought-after single fin design in the world.