Question about Cardo Spirit

The set is supplied with an adhesive pad, so I would cautiously give a YES to your question! The prerequisite is an intercom-prepared helmet and manual dexterity! With standard helmets, the bulges for the loudspeakers would have to be carved out of the polystyrene! But this will invalidate the manufacturer's warranty!
Original text from the Cardo website: Yes. It can be fitted to virtually any helmet - full-face, dirtbike, open-face, 3/4, modular or half helmet. For installation on half helmets, you must purchase the half helmet kit, available separately.