FCS II CI Upright Tri Fin A collaboration with Channel Islands Surfboards, the CI Upright is designed for speed and tight turns. 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. Performance boards with deep concaves and moderate-to-extreme rocker. Fin Family Reactor: Find Speed. Speed, tight turns & snaps. MEDIUM (65Kg - 80Kg / 145 - 175 Lbs) LARGE (75Kg - 90Kg / 165 - 200 Lbs) Fin Base (inches) Base (mm) Depth (inches) Depth (mm) Area (inches) Area (mm) Sweep Deg° Foil MED 4.39 111.4 4.59 116.4 15.04 9700 30.3° Flat LRG 4.50 114.2 4.70 119.3 15.79 10190 30.3° Flat