Getting more performance out of your surf SUP sometimes comes down to what's under the board.

The SIC Three Four XL is a dual thruster fin set built from a glass and carbon composite, bringing a noticeable weight reduction over standard nylon fins without sacrificing the stiffness that drives responsive rail-to-rail surfing. The asymmetrical rear fin works in tandem with the matched front pair to improve flow through turns and keep the tail engaged when you're pushing the board hard.

At the XL size, this set is aimed at bigger riders or anyone running a longer surf SUP who wants more drive and hold in the pocket. The glass and carbon layup gives each fin a lively flex pattern that transmits feedback from the water to your feet, which is exactly what you want when you're reading a wave and committing to a line.

Everything you need for installation is included, and the FCS 2-tab system means setup is straightforward on any compatible board.

• Construction: Glass and carbon composite
• Fin configuration: Dual thruster (2 front + 1 asymmetrical rear)
• Front fins: 4.9" (left and right pair)
• Rear fin: 4.9" asymmetrical
• Fin system: FCS 2-tab with screw set and fin key included
• Intended use: Surf SUP performance