Universal GFN Surficata FCS I fins (Medium 4.5″) – a durable set for river surf, wave pools, and ocean riding. Stability, control, and reliable performance in one package.

These medium-size fins are an ideal choice for surfers looking for dependable performance and long-lasting durability. GFN composite (glass-filled nylon) offers an excellent balance of stiffness and flex for both beginners and advanced riders. The hydrodynamic shape provides stability and precise board control, even when hitting river features.

Is this the right size?

Small fins (S) are great when you want to practice tricks. But if you’re chasing solid carving turns and need dependable hold in your turns, you’ll want something larger (M or L). Fin performance also depends on fin box placement and angles. In Prague’s Štvanice wave, most surfers ride S and M. In České Budějovice, riders use S or sometimes M—but often trim them shorter.

Tested on Europe’s most famous spots including Eisbach, UNIT Surf Pool, and Citywave. Two available variants cover both river-surf setups and classic ocean thruster setups.

Features

• Durable GFN plastic offers a great balance of flex and stability—ideal for beginners and advanced surfers
• Hydrodynamic shape for responsive control and quick reaction
• Suitable for river surf, wave pools, and ocean conditions
• Holds direction reliably during carving turns; fewer fins create a looser, more playful ride

Specifications

• Size: Medium (4.5″)
• Type: FCS I
• Material: GFN (glass-filled nylon)
• Color: Black
• Dimensions: height 115 mm × base 107 mm
• Weight: approx. 124 g (2 pcs) / 185 g (3 pcs)

Compatibility

Fits all FCS I fin boxes (X2, Fusion, SANE) and also works with FCS II boxes (adapter recommended but not strictly necessary).

Available as a 2-piece River Set (left + right) or a 3-piece Ocean Tri Fin Set (left + right + center). If the cut-base version is out of stock, contact us—we can prepare it for you. Note: In the Ocean 3-fin version, the center fin is also size M.

Variants

• 2 pcs – River Set (left + right)
• 👉 River version available in standard or our hand-cut base version, which protects your board from damage (fin box blow-outs) on kickers
• 3 pcs – Ocean Tri Fin Set (left + right + center)
• Compatible with all FCS I fin boxes (X2, Fusion, SANE) and with FCS II fin boxes when using adapters