Regular price SFr. 625.00
Unit price per
C4 Carbon - Protech Freediving Fins
The C4 Carbon Protech Freediving Fins combine lightweight T700 carbon fiber blades with C4's proven foot pocket technology, creating a versatile fin for training, depth sessions and regular open water freediving.
Designed around a medium-soft blade response, the Protech offers an efficient balance between comfort, propulsion and usability. Whether you are building experience in the water or looking for a reliable carbon fin for frequent training, the Protech delivers performance without feeling overly demanding.
Efficient carbon performance for everyday freediving
Many carbon fins are designed with maximum stiffness and specialized competition use in mind. The Protech takes a more versatile approach.
Its T700 carbon fiber blade provides excellent energy transfer while maintaining a smooth and forgiving response throughout the kick cycle. This makes the fin suitable for a wide range of diving styles, from recreational depth training to more advanced open water sessions.
Built around the proven C4 foot pocket system
The Protech uses C4's modern foot pocket design, developed to maximize comfort while minimizing energy loss between the foot and blade. Efficient power transfer and a secure fit help improve overall fin efficiency without compromising comfort during longer dives and training sessions.
Combined with the medium-soft carbon blade, the result is a fin that feels responsive, predictable and comfortable across a wide range of conditions.
Designed for training and open water use
The Protech is particularly attractive for freedivers looking for a carbon fin that can be used regularly rather than only on special occasions. The balanced blade characteristics make it suitable for depth training, open water sessions and general freediving practice.
Its forgiving nature also makes it accessible to divers transitioning from polymer fins into their first carbon fin setup.
Main benefits
- T700 carbon fiber blades: lightweight and efficient energy transfer
- Medium-soft stiffness: comfortable and versatile blade response
- C4 foot pocket technology: efficient power transfer and comfort
- 29° blade angle: optimized hydrodynamics and kicking efficiency
- Rounded water rails: improved water channeling along the blade
- Suitable for a wide range of divers: from progressing freedivers to experienced athletes
- Excellent all-round performance: training, depth sessions and open water use
Technical details
| Brand | C4 Carbon |
| Model | Protech |
| Product type | Freediving fins |
| Dimensions | Complete fin (size 42/43): 890 × 190 mm |
| Blade material | T700 Carbon Fiber |
| Blade stiffness | Medium / Soft |
| Blade angle | 29° |
| Weight | Approx. 790 g per fin |
| Water rails | Rounded section water rails |
| Water rail color | Black |
| Use | Freediving training, depth sessions and open water diving |
Recommended accessories
For maximum comfort and performance, we recommend pairing the Protech fins with suitable neoprene socks or toe protectors.
- 0.5 mm Open Heel Neoprene Socks : additional comfort and protection during longer training sessions.
- 0.5 mm Toe Protector : ideal for warm water and reducing friction inside the foot pocket.
- 1.5 mm Toe Protector : extra protection and improved fit in cooler conditions.
Who should use the C4 Protech?
The Protech is an excellent option for freedivers looking for a versatile carbon fin with a comfortable and forgiving blade response. It is suitable for divers progressing from entry-level equipment as well as experienced freedivers looking for a reliable everyday carbon fin.
Its medium-soft setup makes it especially attractive for divers who prioritize efficiency and comfort over extremely stiff competition-oriented blades.
Availability
The C4 Protech is available in multiple foot pocket sizes.
To provide access to the complete size range, not every size is permanently stocked at our warehouse. Please contact us if you would like to confirm current availability before ordering.
If your preferred size is not immediately available, the typical delivery time is approximately 7–14 days.
External Apnea Passion review
The C4 Protech was independently reviewed by Apnea Passion , who highlighted its balance of comfort, efficiency and overall versatility.
Kaluna Freediving Opinion
Many carbon fins are designed with maximum performance as the primary goal. The Protech takes a slightly different approach.
Instead of focusing purely on extreme stiffness or specialized competition use, the Protech combines the efficiency of T700 carbon blades with a forgiving and versatile Medium/Soft setup. This makes it accessible to a wider range of freedivers while still delivering the responsiveness that makes carbon fins so popular.
For many freedivers, the Protech hits a sweet spot between performance, comfort and usability. It is suitable for regular training, depth sessions and open water diving without feeling overly demanding or technical.
If you are looking for an ultra-stiff competition fin, there are more specialized options available. If you want a carbon fin that performs well across a wide range of conditions and experience levels, the Protech is a very compelling choice.
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The dates don't fit your schedule or you didn't find what you are looking for? We are offering different events, workshops, classes and trips on a regular base - for groups or individually. We will happily take your request and make you a special offer or bring you in contact with other Freedivers to group up for classes and trips.
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