A cycling helmet includes a cap structure, a fastening system of the helmet with straps for chinstrap fastening of the helmet, and securing means for the straps of the fastening system with respect to the cap structure. The securing means include for each strap a pin-like formation which is secured to the free end of the strap and a respective removable retention seat of the pin-like formation which is provided on the cap structure. The securing means also include a gripping end piece which extends from each pin-like formation of the corresponding strap and which is configured to control, when held, the movement of the pin-like formation away from and towards an engagement condition in the retention seat.