Skip to content
🏷️ Shop Clearance — 10-60% off in-stock boards. We ship nationwide from $150, worldwide from $350. Shop now →
Shipping WorldwideLearn more
FCS FCS II Matt Biolos Mayhem Quad Rear Fin Set

FCS

FCS II Matt Biolos Mayhem Quad Rear Fin Set

  • Box:FCS II
  • Size:LRG
  • Construction:Performance Glass

$103

Typical lead time: 5–12 days.

Fits FCS II fin boxes.

Modern FCS II twin-tab base — clicks into any FCS II box. Will not fit Futures boxes.

Not sure what your board has? Read the fin-box guide.

Buy at FCS

Native Lundquist checkout is coming soon. For now, this links to FCS directly.

About this fin

Developed by shaper Matt Biolos, the Mayhem Quad Rears are designed to perfectly complement the raked Mayhem side fins. Performance Material Size Overview Built for performance, this set delivers maximum speed, drive, and control when surfed as a quad. The 80/20 foil allows for smooth, responsive turns while maintaining stability and flow through carves, giving surfers the confidence to push hard in all conditions. Template developed by Matt Biolos to work with the raked Mayhem side fins. Provides maximum speed, drive, and control in a quad set 80/20 foil promotes easy turning with stability and flow when carving Quad Rear (2 fins) Set Ideal Conditions A wide range of conditions, particularly good in critical overhead waves. Board Types Designed to fit the FCS II Fin System. Performance shortboards and hybrid models. Fin Family Reactor: Find Speed. Speed, tight turns & snaps. Performance Core Carbon Often referred to as PC Carbon or PCC, these fins are highly responsive and feature strategically placed carbon that’s designed to complement the fin template. PCC fins suit fast surfing and are favored by power surfers who like to perform explosive turns on critical parts of the wave.

Need help picking a fin? Read the fin guide or message Blake.