O2FiNiTY Fin Blades – Fiberglass and Carbon at a Fair Price

The O2FiNiTY fin blades offer you, as a freediver, a high-quality alternative to conventional carbon or fiberglass fins – technically refined, functionally minimal, and priced to make ambitious training possible even on a budget. Designed for maximum efficiency with minimal material use, O2FiNiTY blades deliver clear performance without unnecessary design frills.

High-Quality Materials – No Compromises

You can choose between robust fiberglass or high-performance carbon – both materials provide excellent rebound strength, durability, and precise underwater feedback. We emphasize a purist aesthetic: the carbon fiber remains visible; the material itself is the design. Different weaves create unique visual dynamics – without prints or colorful graphics. For this reason, the O2FiNiTY logo is discreetly placed on the underside of the blade.

Four versions – tailored to your diving behavior

Fiberglass Translucent

Semi-transparent fiberglass with balanced flex and smooth rebound. Ideal for beginners and freedivers seeking a solid price-performance ratio with proven material.

These high-quality freediving fiberglass blades offer you an excellent combination of performance, comfort, and durability – in both pool and open water. The semi-transparent fiberglass not only provides a modern look but also impresses with balanced flex and smooth rebound. This enables maximum distance with minimal effort and efficient ascents and descents.

Thanks to their material properties, O2FiNiTY fiberglass blades are ideal for demanding beginners and experienced freedivers who value an optimal price/performance ratio. Compared to high-end plastic fins of the second generation, they offer significantly higher durability and more controlled flex – with improved performance. If you've been using simple plastic fins, you'll be surprised how easily these blades move through the water while providing increased thrust. Say goodbye to calf pain and cramps!

3K Twill Carbon

A weave with 3,000 filaments per tow. The twill pattern creates a diagonal structure with high elasticity and a responsive fin feel. Well controllable and efficient – especially suitable for mid-depth dives and technique training.

This blade is made from high-quality 3K carbon in a twill weave. The diagonal structure gives the material a striking, technical look and also improves structural integrity. The combination of high elasticity and optimal rebound allows efficient power transfer with each kick – ideal for dynamic freediving (DYN) in the pool and open water (DYNB).

The soft tuning of the blade is similar to riding a bike in a low gear: less effort, more control, greater endurance. This makes long sessions more relaxed and energy-efficient. The minimalist design deliberately avoids surface finishes – pure carbon, perfectly crafted, that speaks for itself.

8K Plain Carbon

With 8,000 filaments per tow, this weave is denser and stiffer. The plain weave provides a uniform surface and direct power transfer. Ideal for dynamic disciplines and experienced divers who want maximum efficiency.

The 8K carbon blade was specifically developed for performance-oriented freedivers who demand maximum efficiency on every dive. The high-quality carbon fabric consists of 8,000 individual fibers per strand – significantly more than conventional 3K or 4K materials – ensuring maximum torsional stiffness. The plain weave ensures excellent shear resistance, optimizing the blade’s torsional stability in the water.

These properties allow for direct, powerful energy transfer with minimal loss – ideal for freedivers looking to combine depth and distance efficiently.

The classic checkerboard pattern of 8K carbon speaks for itself: technical, elegant, and functional. To maintain the reduced design, the O2FiNiTY logo is discreetly placed on the underside of the blade.

3D Jacquard Carbon

Technically and visually unique. The complex weave creates a structured, modern appearance with excellent rebound and stable flex characteristics. For freedivers who want to stand out visually – without compromising on pure carbon quality.

The 3D Jacquard carbon blade is the logical evolution for demanding freedivers who accept no compromises in deep diving and competitions. The Jacquard weave is based on a modern 3D weaving technique that allows precise control of fiber direction – for maximum material efficiency, optimal power transfer, and exceptional rebound with every kick.

This exclusive weave has been applied to a freediving fin blade for the first time – a first in the high-end freediving fin market! The unique pattern ensures high recognizability and makes the fin a visual statement. To avoid disrupting the design, the O2FiNiTY logo is subtly placed on the underside of the blade.

Carbon 4K vs. 8K – What Does It Mean?

The abbreviations 4K and 8K refer to the number of carbon filaments in the weave strand:

• 4K = 4,000 filaments per tow – more flexible, lighter, more responsive

• 8K = 8,000 filaments per tow – stiffer, denser, more efficient

The higher the number, the more material and stiffness the blade has – important for fin feel, response time, and your personal style.

Universal Compatibility – The Foot Pocket Comes First

A fin blade is only as good as the foot pocket it’s paired with. That’s why O2FiNiTY blades are compatible with three leading foot pocket systems:

• Mares X-Wing
• CETMA s-WiNG
• C4 250

Choose the foot pocket that truly fits your foot – every foot is different. The O2FiNiTY blade can then be precisely matched to your setup. This ensures maximum comfort and optimal power transfer.

Conclusion: O2FiNiTY fin blades stand for minimalistic design, premium materials, and smart modularity. Whether fiberglass or carbon, 4K or 8K – you decide what fits your diving style. All at a price that leaves room for what really matters: time in the water.