FUTURES HS 2+1 6 INCH FINSProduct Information Carbon Side Fins Height 3. 73 Base 3. 63 Area 10. 08 Centre Fin Height 4. 84 Base 4. 53 Area 15. 86 The HS 2+1 fin is highly unique and versatile, and was designed specifically for use with the Haydenshapes Plunder model. The Plunder can be ridden as a single fin using only the HS 2+1 center, giving you a flowing feel with plenty of pivot around the fin during turns. To create a little extra speed, a 2+1 setup can be arranged,