Finology
Everything about this fin, explainedOverview About this fin What it is, who it suits
The Son of Cobra Twin is designed with extra cant angle to fit all Post-modern Twin fins with deep double concave bottom shape, especially the new ...Lost Cobra Killer and other Son of Cobra Round Twin. These fins have a 7.5 degree cant angle (4 degrees is standard for twins) specifically to be paired with the Lost Surfboards x SOC “Cobra Killer” board model. Solid Fiberglass construction combined with balanced base and height measurements provides maximum drive, while the thinner tip offers release and spring off the top.
- Template Category | Neutral (balanced, all-around)
- Construction | Fiberglass
- Size | Large Twin
Construction Control SeriesTraditional fiberglass
Solid fiberglass panels, CNC-cut and hand-finished. The most speed-controlling fins Futures makes, and the pick for powerful surfers who want the same feel underfoot every single wave.
Ride Number 1–4 · Speed control
Indestructible
Fiberglass takes a beatingShallow reef, dry rocks, the odd close-out — fiberglass survives it. Sand out a ding or a scratch and the fin is as good as new. Nothing else in the range is this repairable.
Built for power
Ideal for heavy conditionsWhen you are taking off late and stalling for the barrel, controlling your speed is the whole game. That is what these were built for — hence the name. Heading somewhere with real power behind it? Keep a set in the quiver.
Template Neutral The middle ground
Enough rake to hold, enough upright to turn tight. Neutral is the all-rounder of the three templates and where most surfers land — it does not force you into a style, it just does what you ask.
Specifications This fin's numbers Area, height, base, angle and foil
Ride Number 1–4 · Speed control How Futures rates every fin
Feel = Flex + Rake + Foil
Futures rates every construction on a 1–10 scale. Low numbers hold a predictable line and control your speed. High numbers generate speed and snap out of turns. Three physical properties combine to produce it, and they are not weighted equally — flex counts for the most, then rake, then foil.
Solid, engaged, predictable. Built for powerful conditions.
All-around. Drive, hold and looseness in equal measure.
Springy, fluid, responsive. Built to create speed from nothing.
Flex is how much the fin bends under load — soft generates speed, stable controls it. Rake is the sweep of the outline — upright turns tight, laid-back holds long. Foil is the cross-section — a V or V2 foil feels fluid, a flat foil feels engaged.
Sizing Which size am I? Sized to rider weight, not board length
Futures sizes fins to the surfer, not the board. Find your weight, then fine-tune with construction and template once you know your size.
XSmall / Grom
35 – 50kg
Small
45 – 60kg
Medium
55 – 80kg
Large
75kg+
The bands overlap on purpose. If you sit on a boundary, size up for more hold and drive, or down for a looser, easier-to-turn feel.
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