A respiratory mask assembly for delivering breathable gas to a patient has a frame (12) with a main body and lateral sides of the main body equipped with locking clip receiver means (54). A locking clip (28) is coupled to a headgear assembly at the rear portion and to the receiver means at the front portion. The rear portion has a cross bar forming an opening through which the headgear assembly can pass, whilst the front is provided with spring arms (36), flexible in the plane of the main body.
