Interface comprising a rolling nasal bridge portion

A patient interface comprising:

• a mask assembly, the mask assembly comprising:
• a seal comprising a flange that engages a face of a user;
• a mask base comprising a concave inner surface portion, an outer surface portion, a first engagement portion, a second engagement portion and an outlet opening positioned on a proximal end of the mask base;
• wherein the mask base is circumscribed by a lip extending along an outermost periphery of the proximal end of the mask base, the seal being overmolded to the lip;
• wherein the first engagement portion comprises a first recessed portion being recessed inwardly from the outer surface portion and the concave inner surface portion, the first recessed portion including a first opening in the outer surface portion and the concave inner surface portion, spaced away from the outermost periphery of the proximal end of the mask base, and defined by a first wall with a first tab defined along the first wall;
• wherein the second engagement portion comprises a second recessed portion being recessed inwardly from the outer surface portion and the concave inner surface portion, the second recessed portion including a second opening in the outer surface portion and the concave inner surface portion, spaced away from the outermost periphery of the proximal end of the mask base, and defined by a second wall with a second tab defined along the second wall;
• wherein the outermost periphery of the proximal end of the mask base extends laterally outward of the first and second openings relative to a mid-sagittal plane of the user, in use;
• and
• a first clip and a second clip from a headgear assembly, the first clip being removably connected to the first engagement portion of the mask base and the second clip being removably connected to the second engagement portion of the mask base, the first clip and the second clips comprising first and second interlock features configured to engage the first and second tabs, respectively, in a snap-fit manner, the first and second walls limiting rotation of the first and second clips, respectively, when engaged, the first and second clips also comprising first and second lower connectors, respectively, configured to connect with distal ends of headgear straps.