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The Greenough 4-A Single Fin is the most iconic, functional and versatile single fin available, because it works extremely well on just about every type of surfboard. The 4-A has been True Ames' bread and butter for over 40 years now, and i...
Reviews
5.0
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Awesome all around fin, the color detail looks amazing too!
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Ulises · February 16, 2026
I’ve used this fin in an array of different boards for the last 20+ years. If you ride a single fin or 2+1 setup this fin is the standard by which all others are judged. It’s absolutely perfect in every way. If you’re questioning if a board actually works or not throw this in and it’ll answer your question.
