FCS Surfboard Fins FCS II CI Upright Quad Rear Fin Set

Designed by Britt Merrick, the CI Upright Quad Rears are shaped to pair seamlessly with the upright CI side fins. Featuring a neutral-raked template, they deliver a solid balance of control and stability while still allowing for tight, pivot-style turns. The 50/50 foil enhances directional control and confidence, making this set a reliable choice for surfers looking to fine-tune their quad set

A collaboration with Channel Islands Surfboards, the CI Upright is designed for speed & tight turns
A template that comes to life in punchy hollow waves, but also suit conditions where you need that start-up speed to get going.
Neutral-raked template developed by Britt Merrick to work with upright CI side fins
Provides control and stability, while still allowing for tight pivot turns
50/50 foil provides stability and directional control
Quad Rear (2 fins) set

Ideal Conditions

Hollow steep waves, punchy beach breaks

Board Types

Designed to fit the FCS II Fin System.
Performance boards with relaxed rocker
Deisgned for CI performance + hybrid models

Fin Family

Quad: Carver
Performance Core 

Performance Core (PC) fins are made using a multi-layered resin transfer molding process. The flex pattern in PC fins extends progressively from the base through to the tip, helping the surfer to maintain drive and hold through a turn. This versatile fin material is light, and can be used in a variety of different conditions.