used Greenough 4A 10.5" Red Fiberglass Longboard Fin

used Greenough 4A 10.5" Red Fiberglass Longboard Fin

Single / X-Large / Performance Longboard

The Greenough 4-A has been the most popular single fin worldwide. Its incredible functionality and versatility means it’ll just work on about any longboard and any wave.

The developer of this fun fin is George Greenough, a revolutionary whom the surf world is forever stoked by his wave-riding performance innovations beginning in the 1960s. He made it possible for longboard surfboards to grow into more progressive surfing in the pocket of the wave. Greenough found inspiration from the ocean for his fin templates as he studied the tail fins of tuna.  Likely the the fastest and most maneuverable fish in the water. The high-aspect ratio design he created let surfers to place themselves in more critical parts of the wave and execute more radical turns. This made high performance surfing possible.

The Greenough 4-A is a truly well-balanced fin. Its full base that tapers moderately to a  flexible tip gives a solid amount of drive off the bottom, and responsiveness throughout arcing turns. Designed for both speed generation and for allowing surfing in the pocket. The 4-A design is a fin that will hold when needed and release when you want it.

• The all-around fin, the 4-A is one of the most versatile single fins ever designed 
• Its the best of both worlds: performance in the solid base and width create stability and drive, while the rake and flexible tip enables top-to-bottom turns and maneuverability
• Fiberglass construction, flat matte finish