Den Trainer nicht fallen lassen

If your fins are too loose

Flach und tropfenförmig zur Minimierung des Widerstands

maximaler Speed

It just looks cool

C4 Carbon - Insole for footpcokets logo Den Trainer nicht fallen lassenC4 Carbon Ergonomic fin insoles C4 insoles have been designed specifically for diving. The design and materials used are specific for the use in diving fin shoes. C4 insoles are available in 3 sizes that can be used in footpockets from size 38 to 45, thanks to the possibility of being cut to size on pre existing cutting lines. ERGONOMIC FIN INSOLES Thanks to their anatomical shape, C4 insoles increase the comfort inside the fin shoe pockets which,