The FCS II Mayhem Pivot Tri Fin Set is Matt Biolos' go-to template for low-rockered fun boards and beach break sessions. Part of the Reactor fin family, it's built for speed, tight turns and quick changes of direction, and brings extra agility to boards like the RNF and Puddle Jumper.
| Fin system | FCS II |
| Setup | Thruster (3 fins) |
| Construction | PC Carbon |
| Sizes | Small, Medium, Large |
| Colors | Moss, Sand, Marine |
As a general guide by surfer weight: Small about 120–155 lb; Medium about 145–175 lb; Large about 165–200 lb. If you're between sizes, size up for more hold or down for a looser feel.
Will these fit my board? They fit boards with FCS II fin boxes. They won't fit original FCS two-tab plugs or Futures boxes.
Pivot or Driver? The Pivot is more upright for tight, quick turns. The Mayhem Driver has more rake for drive and long carves.
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