Introduction
The Sigalsub Tsunami fins mark Sigalsub’s first entry into the composite fin segment, an important step in a highly competitive market, where companies like Cetma Composites and C4 Carbon lead. From the very first impression, the result is clearly very good: this is not an experimental or secondary product, but a well-thought-out project with clear technical choices. For a debut in the carbon fin world for spearfishing and pure freediving, Sigalsub steps in with confidence and credibility. Well done to the designer of the Tsunami fins, Andrea Madeddu!
Carbon blades
The Tsunami fins feature 100% carbon fiber blades made of T700 12K Prepreg, a material known for its uniformity, strength, and consistency in performance. It is fair to note that Sigalsub does not manufacture the carbon internally, sourcing it from China; however, the perceived quality and, above all, what we observed in our tests have nothing to envy good composite blades produced in Europe.
The T700 12K Prepreg carbon practically eliminates visible defects and ensures consistent performance over time, excellent blade durability, and a convincing elastic response.
The fins are available in Super Soft, Soft, Medium, and Hard stiffnesses, with a 23° angle between foot pocket and blade, a versatile choice suitable for both spearfishers and dedicated freedivers. Thrust is always effective, even during demanding ascents from deeper dives, with a smooth and progressive kick.
The foot pocket
The Sigalsub Tsunami foot pocket is made of thermo-rubber with differentiated thicknesses, an intelligent solution combining comfort and efficient power transfer. The fit is soft and comfortable where needed, while key areas — the instep and sole — are properly reinforced to transmit force from the foot to the blade.
From a design perspective, it is clear that the mold is derived from the excellent 350 foot pocket by H.Dessault, known for being lightweight and very snug around the foot. It does not quite reach the absolute benchmark level of the 250 by C4 Carbon, but it remains a solid, functional, and pleasant solution in use. The wide range of sizes — from 36/37 to 46/47 — further strengthens the overall package.
Performance and assembly
Thrust, progression, and kick control are indicated by Sigalsub to be excellent, while leg fatigue remains limited. According to the Italian company, the Tsunami fins perform very well both in deep dives and in pool freediving, confirming their truly versatile nature. We will soon publish our results in the Test of the Champion.
The connection between foot pocket and blade is handled by a single Allen screw, combined with ultra-short rails, allowing for quick and precise assembly. At the same time, the threaded insert embedded in a plastic plate makes the blade–foot pocket connection secure and durable, an important detail in this category of product.
Conclusions
The full test will be published soon, but even at this stage one thing is clear: Sigalsub enters the composite fin market for spearfishing with its head held high. As a first attempt, the Tsunami project is well-centered, coherent, and technically mature, leaving very positive impressions and opening interesting perspectives for the brand’s future developments.
