Headgear for a respiratory mask includes a strap arrangement comprising front strap portions adapted to be disposed over a patient's cheeks and each having a connector adapted for attachment to an airway interfacing portion, and a cover provided to each front strap portion and structured to at least partially encapsulate the front strap portion. The cover includes side portions adapted to be wrapped around the front strap portion and releasably fastened to one another.

A fastening device for fastening an element to the slot of a C-profile rail with a gripping element which can be inserted through the slot into the interior of the profile rail and which can be turned in the profile rail around at least one screw-in axis in such a way that it grips behind the leg of the profile rail that delimits the slot is provided. The gripping element has at least one receptacle that runs perpendicular to the screw-in axis and that serves to secure a threaded rod.

A fixture includes a main body and a fastening unit. The main body includes a passage and the fastening unit is disposed at the main body. The fastening unit includes a tension member and an adjusting member, The tension member includes a first end portion, a surrounding portion and a second portion. The first end portion is connected to the main body. The surrounding portion is connected to the first end portion and the second end portion. The second end portion is passed through the passage for forming a fastening space surrounded by the first end portion. the main body and the surrounding portion. The adjusting member disposed at the main body is coupled with the tension member and is rotated about an axis relative to the main body so as to adjust the fastening space. The axis passes through the main body but not the fastening space.