FCS - FCS II Al Merrick - PC - XS - 3FIN 5" That is what they have

That is what they have been built for

These will cut paths for water and air to pass quickly with forced direction

The fin system is single fin

It's a drag less fin due to the narrow base

FCS - FCS II Al Merrick - PC - XS - 3FIN 5" That is what they haveHigh Speed Thruster Fins for Lightweight Surfers The FCS II Al Merrick Tri Fins (XS) are tuned for lightweight surfers who want speed, control, and fast release in steep or punchy waves. With a raked template for powerful drive and a lively flex pattern, these fins deliver sharp precision, smooth transitions and confidence when laying into progressive turns. Features: Template: Raked AM template for maximum speed & drive. Performance: Fast