Captain Fin Co. Alex Knost Classic Fin A throwback aesthetic matches the retro-inspired template of the Alex Knost Classic and with it’s wide base and upright profile it will lend a vintage, yet speedy and responsive feel to any mid-length, log, or ‘70s-era style single. Details: 7.5"-8.5" Template: Pivot—loose, upright template, but with a wide base for down-the-line speed. Ideal Board: Mid-Lengths with 2 + 1 fin setups. Construction: Fiberglass construction 9.5" Template: Balanced—moderately upright template, wider base for classic logging or more hold for a step-up tube shooter. Ideal Board: Mid-Lengths with 2 + 1 fin setups. Construction: Fiberglass construction.