An adapter system for a protective mask (2) serves for movably attaching a protective mask (2) to a helmet (1), wherein the adapter system includes two individual adapters (3), which on the one hand serve for coupling to a connecting device (11) of the helmet (1) by means of a helmet coupling (31) and on the other hand for attaching to the protective mask (2) by means of a mask coupling (37), and the adapters (3) each respectively have a swivelling joint (34), around which a protective mask (2) attached to the adapter (3) is capable of being swivelled. In doing so, the adapters (3) each respectively include a swivelling arm (35) capable of being swivelled relative to the swivelling joint (34), wherein the swivelling arm (35) is adjustable in its length.
