The Greenough 4-A Surfboard Fin a timeless classic.Its also been the most popular single fin worldwide for decadesand for good reasonits incredible functionality and versatility means itll work on just about anything.

The Greenough 4-A is a truly well-balanced fin. Its full base coupled with a 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.

• A true all-arounder, the 4-A is one of the most versatile single fins ever designed
• The larger sizes are great for single fin longboards, while the smaller and medium sizes pair well with mid-lengths, performance single fins, and 2+1s
• Best of both worlds performance: solid base and width create stability and drive, while the rake and flexible tip enables top-to-bottom turns and maneuverability
• Solid fiberglass construction, flat matte finish.