FCS II Channel Islands Upright Performance Core Tri Surfboard Fins - Large/WhiteA collaboration with Channel Islands Surfboards, the CI Upright is designed for speed and tight turns. Overview 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 can also suit conditions where you need the start up speed to get going. Ideal Conditions Hollow steep waves, punchy beach breaks. Board Types Designed to fit the FCS II Fin System.