Helmet provided with a ring for connecting the helmet to an anti-theft system

A helmet comprising a hard shell and a flexible shell extending inside the hard shell, the helmet including an attachment device suitable for attaching to an antitheft system external to the helmet, wherein the attachment device comprises a ring suitable for having a link of said antitheft system external to the helmet pass therethrough, the ring being mechanically connected to the hard shell so as to be movable relative to the hard shell between a stowed position and an extended position;

• in the stowed position, a major portion of the ring is located inside a cavity that is defined at least in part by said hard shell and, in the extended position, at least a portion of the ring is located outside said cavity to enable said link of the antitheft system to pass through the ring, the
• wherein helmet includes a rigid base that is rigidly fastened against the hard shell, said ring being mechanically connected to the hard shell via the rigid base;
• and
• wherein said base further includes guide surfaces for guiding movement of said ring relative to the base in order to guide the movement of the ring between the stowed position and the extended position, the guide surfaces being fixed in position relative to said hard shell and being located for the most part inside said cavity.