C4 PROTECH Carbon Fins
C4 PROTECH Carbon Fins
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Description
The PROtech are fins designed for athletes who live freediving as a discipline of precision. They come from a scientific study of water flows, with three-dimensional geometries that follow the natural movement of the body for maximum fluidity and efficiency.
The foot pocket distinguishes right and left foot for a real anatomical fit: no pressure points, no energy dispersion. The structural monoblock blade–foot pocket guarantees instant thrust transmission.
The fins float in a controlled way thanks to lateral hydrodynamic stabilizers, maintaining trim and stability both in the pool and in depth.
The blades are made 100% of high-quality carbon with multilayer layering, for progressive energy release, without vibrations.
The result: maximum performance with a smooth, continuous and technical kick.
Key points
- Right/left anatomical foot pocket
- Monoblock blade–foot pocket
- 3D hydrodynamic geometry
- Controlled buoyancy
- High-performance multilayer carbon
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Specifications
- Dimensions: 42/43 = 890 x 190 mm
- Blade Material: T700 Carbon Fiber
- Blade hardness: Soft
- Water Rails Color: Black
- Water Rails: Rounded section water rails
- EU sizes: 36/37 – 38/39 – 40/41 – 42/43 – 44/45
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Size Guide
How to correctly measure your foot
- Preparation Place a blank sheet of paper against a wall and tape it down so it doesn’t move.
- Measuring the foot length Stand with your heel firmly against the wall. Using a marker, mark the point corresponding to your big toe (the longest toe).
- Consult the size chart Take the PROtech foot pocket size chart and, based on your usual shoe size, find the corresponding P.A. and P.B. values.
- Marking measurement points On the sheet, starting from the big toe mark, measure and mark the distances P.A. and P.B. as indicated in the chart. Draw two lines parallel to the wall at these points: they will serve as reference lines for circumference measurements.
- Measuring the circumferences Place your foot back on the sheet, heel against the wall and big toe on the mark. Using a string or tape measure, measure the foot circumference at both points (first at P.A., then at P.B.) and record the results on the sheet.
- Measuring the total length Remove your foot and measure the distance between the wall and the big toe mark — this is your foot length.
- Comparing with the chart Compare the measured values with those in the PROtech size chart to identify the most accurate fit for your foot and needs.
Practical example:
The measurements in the first row of the table (size 36/37) are used as a demonstration reference to illustrate the legend.
Legend:
L = Foot length (from heel to big toe)
PA = Measurement from the big toe to determine Circumference A (7 cm back)
CA = Circumference A (taken 7 cm from the big toe, around the foot)
PB = Measurement from the big toe to determine Circumference B (11.5 cm back)
CB = Circumference B (taken 11.5 cm from the big toe, around the foot)Note: The circumferences refer to the shoe’s internal diameter: the foot should have a slightly larger circumference to ensure a proper fit.