If you’re curious about the fin that CJ Nelson uses on his 8’0” Outlier surfboard, the answer is the 9.5” Flying Diamonds Involvement fin. This large fin allows CJ to push hard and achieve excellent performance on the board. If you’re an average surfer, it’s recommended that you start with an 8.5” fin and work your way up to larger sizes as you gain confidence and begin to surf the rail more. With the right fin, you can unlock the full potential of your surfboard and improve your overall surfing