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 it is still the most popular single fin design there is due to it's all-around and well-balanced perf
5.0
13 ratings
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A wonderful compliment to my 9’5” involvement style log. One of the best fins to ride on a longboard ever made.
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brad · January 14, 2026
Liked it alot
B
Brirn · November 28, 2025
Great fin that will work really well in a wide range of boards.
