Details Captain Fin – Alex Knost – 8.5 – 1 Fin A throwback aesthetic matches the retro-inspired template of the Alex Knost Classic 8.5″ and with it’s wide base and upright profile it will lend a vintage, yet speedy and responsive feel to any mid-length or 70s-era style single. Template | Pivotloose, upright template, but with a wide base for down-the-line speed. Construction | Fiberglass Ideal Board | Mid-Lengths with 2 1 fin setups. Fin Specification Area 30.39 Height 8.5 Base 5.7 Foil 50/50