There is a reason this is the most iconic, functional and versatile single fin available...it works on just about anything! The Greenough 4-A has been our bread and butter for close to 40 years now, and is still the most popular single fin design there is.
A truly well-balanced fin...the full base coupled with the tapering, moderately flexible tip provides a solid amount of drive off the bottom, and an acute responsiveness through arcing turns. Designed for both speed generation and spending time surfing in the pocket, the 4-A is a fin that will hold when you need it to and release when the time is right.
FCS Fin Size Chart | Fin Size |
Under 120lbs | XS |
140 - 155lbs | M |
165 - 200lbs | L |
190lbs+ | XL |
Futures Fin Size Chart | Fin Size |
75 - 115lbs | XS |
105 - 155lbs | S |
145 - 195lbs | M |
180lbs+ | L |
Longboard Fin Size Chart | |
Board Size | Fin Size |
6' - 6'11" | 6" +/- |
7' - 7'11" | 7" +/- |
8' - 8'11" | 8" +/- |
9' & up | 9" +/- |
FCS Fin Size Chart | Fin Size |
Under 120lbs | XS |
140 - 155lbs | M |
165 - 200lbs | L |
190lbs+ | XL |
Futures Fin Size Chart | Fin Size |
75 - 115lbs | XS |
105 - 155lbs | S |
145 - 195lbs | M |
180lbs+ | L |
Longboard Fin Size Chart | |
Board Size | Fin Size |
6' - 6'11" | 6" +/- |
7' - 7'11" | 7" +/- |
8' - 8'11" | 8" +/- |
9' & up | 9" +/- |