Finology
Everything about this fin, explainedOverview About this fin What it is, who it suits
Futures Jack Robinson Signature TechflexThruster Fins
Elevate your performance with Jack Robinson's Signature Thruster Fin, a large fin from the Rake template category, expertly designed to match Jack’s surfing style above and below the lip. With extensive testing at some of the world's best waves, this fin has proven its exceptional capabilities.
Crafted with Techflex construction, it’s Jack's go-to choice for when the waves are pumping, providing enhanced control and responsiveness. The center fin is smaller than the side fins, ensuring increased maneuverability without compromising stability.
Techflex fins are engineered to be stiff and lightweight, delivering a solid and engaged feel for powerful surfers tackling challenging conditions. Experience the thrill of Jack’s signature style—available now at Welcome Boardstore!
- Template Category | Rake (drawn-out/drive)
- Construction | Techflex
- Ride Number | Speed Control – 3.2
- Size | Large (80+ kgs)
Construction TechflexLight like Honeycomb. Stiff like fiberglass.
Engineered stiff and light. Solid and engaged on big drops, then light and responsive the moment you engage the rail. Sits just above the fiberglass line — built for powerful surfers and powerful waves.
Ride Number 3.2 · Speed control
Techflex spans 3–4.5; this fin sits at 3.2.
Stiff and light
Speed control + responseFor surfers who want big-wave hold with a bit more spring off the lip. The honeycomb core keeps the weight down, the carbon keeps it stiff and engaged. Solid rail turns and drive down the line, springy when you ask for it.
3K carbon
Controlled flex3K carbon runs along the base and the tip, making the fin as light as Honeycomb while holding the stiffness of fiberglass. The result is a vertical flex pattern — control and drive down the line, lively and free off the lip.
Signature Techflex
Ridden by John JohnJohn John Florence designed his Techflex signature as a larger complement to the F4 template. Medium base carrying through to a medium tip, and his weapon of choice in just about any condition.
Template Rake Drawn-out, swept back
A long, drawn-out outline that holds all the way through a turn. Rake templates carve rather than snap — drive off the bottom, hold in the pocket, and the most stability of the three shapes. If you surf on rail and like long lines, this is your shape.
Specifications This fin's numbers Area, height, base, angle and foil
Ride Number 3.2 · 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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