I received the Speeder Carbo HD (High Density) fins from Salvimar for this test. On paper, they seemed like a very promising product—and I was definitely eager to try them in the water, especially after talking with a few friends who use them regularly and had only positive things to say. I had also previously tested the Speeder HD fins in technopolymer and was curious to see the differences.

As soon as they arrived, I opened the cardboard packaging. The fins came in a sturdy, white/semi-transparent plastic bag. The first thing I noticed—even before opening the bag—was the weight. They are surprisingly light!

At first glance, I saw the Speeder HD foot pockets (65 shore hardness), which are also used on the technopolymer version. They come in a stylish military green, while the blade has the classic gray/black weave pattern typical of carbon fiber. Both the upper and lower surfaces of the blade feature a large “Salvimar” logo in brown/gold, and just below it in smaller text, the name “Speeder Carbo HD,” also in brown/gold.

The design of the fins is sleek and modern, with a narrow section near the foot pocket (11 cm wide), flaring out to 21 cm at the middle of the blade, then tapering again towards the tip, which ends in a pyramid-like shape with a rounded point (only 6 cm). Total weight, with size 39/40 foot pockets, is 675 grams. Blade length, measured from the 29-degree angle to the tip (excluding foot pocket), is 76 cm. The blade’s thickness varies, ranging from 0.6 mm at the tip to 2.5 mm under the foot.

The Speeder fins are the result of a technical study of form, structure, and materials; they were designed to outperform previous-generation fins and improve foot pocket comfort. Salvimar developed a technology involving underfoot side rails to enhance power transmission, ensuring maximum efficiency with every kick. This innovation boosts the fins' hydrodynamics. Because of it, the blade at the connection point with the foot pocket is much narrower than on most models, preventing water from simply bouncing off and instead channeling it efficiently along the blade. This design is actually inspired by nature—fish have a narrower caudal peduncle (tail stem) compared to their caudal fin to better direct water toward the tail.

After thorough studies, Salvimar concluded that long fins function in a similar way: the narrower the section at the base of the foot pocket, the more water particles are channeled toward the tip of the blade, optimizing thrust. The rails also feature rigid clips co-molded with rubber that firmly attach the foot pocket to the blade, improving energy transfer.

The foot pocket incorporates a polypropylene sole that offers rigidity while keeping the upper soft and lightweight (65 shore). This, combined with the rigid rail clips (glossy black), enhances the bond between blade and foot pocket, making the fin a highly unified system.

The choice of materials has optimized weight and strength through a variable-thickness foot pocket, designed to be lightweight without sacrificing durability. In high-stress areas, the rubber thickness increases to ensure that all finning energy is directed to the blade.

The design of the toe area was carefully crafted: it is closed to protect the toes without compromising comfort or efficiency. Inside the rails, there’s a niche for the big toe to ensure perfect foot-to-knee alignment and a stable kick. This innovative design ensures excellent comfort and a snug fit. What’s more, the Speeder HD can also be worn without socks.

Salvimar also dedicated significant effort to improving the connection system, enhancing overall functionality. The blade is secured not only by insertion but also by two stainless steel screws near the arch of the foot. This area also features two marked grooves that help channel water toward the blade body.

The Speeder Carbo HD is made from TW-K03 Pre-Peg high modulus carbon fiber and is autoclave-cured. This method eliminates air bubbles and weak points, and Salvimar optimized the resin content that binds the composite fibers. “The K03 carbon offers top-tier performance with excellent flexibility and impact resistance,” the company explains.

Thanks to an innovative layering process, the blade features a very precise variable thickness structure, allowing for accurate control of flex and thrust zones. This results in strong performance and great elastic return, while minimizing effort. One-centimeter rubber water rails run along the blade and end near the tip’s base.

Available in four sizes: 39/40, 41/42, 43/44, and 45/46.

In the Water

A southern wind lashes the Civitavecchia coastline. It’s January, with water temperatures around 14°C. The wind is stirring up the surface layers but also clearing away the suspended silt in the early hours. A perfect day to go for the big catch!

I’m standing on a lava rock, hurriedly suiting up under a cold-water shower. Time to slip on the fins. The foot pocket fits perfectly—I chose size 39/40, and it matches my shoe size precisely.

I plan to test the Speeder Carbo HDs by fishing around known holes for white seabream and brown meagres. I head toward the first waypoint, about 200 meters away. I use this stretch to observe the fins’ behavior—each model has its own ideal kick pattern. Since these are designed for stronger divers and made with a stiffer blend, they perform best with a short, tight kick.

Even with a brisk tempo, my legs don’t get fatigued, though I can tell this model isn’t for everyone. I'm used to stiff fins, especially for winter diving, but they could be tiring for someone not accustomed to them.

Arriving at the “sentinel” hole (so-called because if it’s empty, the rest likely are too), I prepare to dive. It’s about 15 meters deep, and visibility is not ideal. I aim my Ares 75 into the hole—but it’s empty. I turn to ascend, and the Speeder Carbo HDs give me a powerful push off the bottom. In no time, I’m at the surface!

I decide to switch tactics, as hole hunting is proving fruitless. I grab my back weight from the float and head inshore to look for sea bass. I alternate between ambush and still hunting in shallow waters, wearing a heavy setup due to the depth. Still, the fins maintain their power output beautifully—even with all the weight from the belt and back weight.

A medium-sized bass escapes after I knock the right fin blade against a rock—an incoming wave pushed me slightly. Not discouraged, I mentally account for the blade’s length during my next ambushes and manage to land three nice mullets. Unfortunately, no sea bass today.

Still, I’m satisfied—the dinner is safe. As I head back, I reflect on the fins’ performance.

Here are my thoughts: the Speeder Carbo HD requires strong legs and shines in mid to deep water fishing. They offer excellent push and bottom lift, especially when diving with heavy lead during winter outings. Just keep your kick narrow and efficient. They’re well-built, quite durable, and best suited for experienced divers—not ideal for beginners due to their stiffness.

During my following ten dives, they confirmed my initial impressions—even at slightly greater depths.

Final Scorecard

Design & Concept: Meticulous attention to detail, aimed at experienced divers, with cutting-edge solutions. 9 

Materials: TW-K03 Pre-Peg carbon fiber blade and soft 65-shore rubber foot pocket. 8 

Performance: Best with heavy weights (like winter diving) or mid/deep-water fishing. With a tight, lively kick, they perform at the top level. 9 

Design: Innovative foot pocket design, minimized blade-foot junction, and variable thickness blade are all significant advantages. 8 

Comfort: The Speeder foot pocket is incredibly comfortable. Great toe support prevents cramping. Can be used without socks in summer. Designed for strong divers, otherwise they might be challenging. 9 

Value for Money: Around €300 for a fully Made-in-Italy fin. Not bad at all! 9