Round Thruster Fins Set - ST Box
Program
A balanced all-round fin designed to combine control, drive, and maneuverability across a wide range of conditions.
Presentation
The Round is the most versatile fin in the performance range. It delivers an optimal balance of hold, speed, and maneuverability without pushing the board toward any extreme behavior. It’s a reassuring, predictable, and efficient fin, capable of performing in a wide variety of conditions and across many board types.
Its neutral template, combined with slightly increased surface area through the tip, generates lift at the top of the turn while maintaining smooth flow. The board stays stable at high speed while still retaining the ability to turn easily when the section tightens up. This distribution produces progressive and controlled arcs.
The Round allows committed turns without sacrificing control, while remaining reactive enough to link transitions smoothly. Accessible yet high-performing, it still holds plenty of potential in more powerful conditions.
It adapts well to shortboards, modern mid-lengths, and both quad and thruster setups. A reliable and balanced fin, ideal for versatile surfing.
Template
Neutral template with moderate rake, offering an ideal balance between pivot and projection. This shape allows smooth and progressive turns while maintaining forgiving maneuverability for accessible and versatile surfing.

Base
Base tapering quickly to facilitate rail-to-rail transitions while retaining enough width to maintain stable and predictable drive.

Depth
Moderate depth, suited to all conditions, maintaining good levels of hold without adding drag or limiting speed.

Surface area
Slightly increased surface area toward the tip, generating lift and improving hold through committed turns. This distribution delivers a smooth and progressive surfing feel, with an excellent balance between control and flow.

Setup
The thruster setup is a reference for surfers seeking a balance between control, speed, and maneuverability. The center fin provides line hold and stability through turns, while the side fins enhance drive and engagement during direction changes. This setup delivers reliable and versatile performance, suited both to committed maneuvers and more technical sections, across a wide range of conditions.

Technical sheet
Round Thruster Fins Set - ST Box fiberglass / XXS / WHITE AND BLACK


Buying guide
Who is it for?
The Round is aimed at all surfers, from progressing intermediates to experts. It is ideal for those looking for a simple, reliable, and versatile fin. It allows surfing in all conditions without overthinking. It offers a good balance between control, maneuverability, and speed. It is a reassuring and easy-to-use fin, perfect for everyday surfing.
What is it for?
The Round thruster is the most versatile fin in the range. It works on almost all modern shortboards and mid-lengths, across a wide variety of conditions. It offers an excellent balance of drive, grip, and maneuverability, allowing smooth linked turns while maintaining responsiveness. It is ideal for daily use, from small beach breaks to more solid waves. It is the fin to choose for a clean and predictable feel.
What size?

Fin size mainly depends on the following factors:
- body weight
- surfer’s style
- board volume
- surf conditions
A heavier or more powerful surfer will need larger fins to maintain enough surface in the water for grip and control.
A lighter surfer can use smaller fins to reduce drag and make the board more maneuverable.
Surf style also plays an important role. A surfer who prioritizes quick turns and short transitions may choose slightly smaller fins for more responsiveness. A surfer who drives hard through turns or rides powerful waves will benefit from larger fins for stability and projection.
In general:
- Larger = more grip and control
- Smaller = more speed and maneuverability
The more voluminous the board, the more fin surface is needed to control it.
Finally, conditions also influence the choice. In small or soft waves, slightly smaller fins help generate more speed.
Whereas in fast or hollow waves, larger fins provide more grip and security in critical sections.
In summary, the right size is the one that balances speed, control, and maneuverability depending on the surfer, the board, and the waves.
Equipments
The set includes two side fins (right and left) and one center fin.
It comes with a fin key for installation.
Delivery
Delivery
Orders are prepared and shipped quickly: most are dispatched within 24 to 48 business hours.
The delivery time, meaning the transit of the parcel to your address, then depends on the delivery location and the carrier.
Shipping costs are transparent and calculated based on weight, volume, and delivery address.
Exchanges & Returns
You have a 14-day right of withdrawal to return or exchange a new product that does not suit you.
Eco-Responsible Packaging
We prioritize sustainable, recyclable, and reusable packaging solutions, minimizing single-use plastic as much as possible while ensuring optimal protection for products, including large items.











