The FCS II Mayhem Driver Tri Fin Set is Matt Biolos' performance thruster template, built for surfers who like to put a board on rail and draw long, powerful lines. It comes from the FCS Carver family, so it has a long, swept outline that holds through hard bottom turns and full carves on open faces.
The Mayhem Driver suits intermediate to advanced surfers riding performance shortboards and everyday boards like the Lost RNF or Puddle Jumper. It works best in point breaks, open walls and hollow beach breaks where hold and projection matter.
| Fin system | FCS II |
| Setup | Thruster (3 fins) |
| Template | Carver family |
| Construction | Performance Core Carbon + AirCore |
| Sizes | Small (Red), Medium (White), Large (Blue) |
As a general guide, Small fits surfers about 120–155 lb, Medium about 145–175 lb and Large about 165–200 lb. If you sit between sizes, go up for more hold or down for a looser feel.
Will these fit my board? They fit any board with FCS II fin boxes. They don't fit the original FCS (two-tab) plugs or Futures boxes.
Driver or Pivot? The Driver has more rake for drive and long carves. The Mayhem Pivot is more upright for tight, snappy turns in the pocket.
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