The brand C4 has developed this pair of ultra-reactive 100% carbon fins for spearfishers looking for the efficiency of carbon.The FAST 400 25 hardness fins are made from 100% T700 SUPERFORCE carbon fibre. The carbon fin with an explosive launch!
Foot pocket
The removable 400 shoe is made from thermo-plastic conventional rubber. This makes it extremely lightweight.
Thanks to its hydrodynamic shape and lightweight structure, it transfers energy from your foot directly to the fin without any losses.
Blade
The T700 SUPERFORCE carbon fibre is 40% more durable than standard fibres. It presents a high level of resistance and excellent elasticity. The carbon fibre of the FAST 400 can ideally demonstrate its elasticity and low energy absorption.
Dimensions
Blade dimensions: 786 mm x 190 mm
Why choose a pair of carbon fins?
A carbon fin offers excellent yield. Lighter yet more powerful, it will mean you’re less fatigued during your sessions.
Be careful, as it is a lot more fragile than a plastic fin!
What should I do if I break my blade?
You can simply replace the damaged blade. Get in touch with our workshops.
4 sizes available in Decathlon
40/41 – 42/43 – 44/45 – 46/47





















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