Interface comprising a nasal sealing portion

A mask assembly for use in providing positive pressure respiratory therapy, the mask assembly comprising:

• a mask base comprising a base wall formed of a rigid material, an inlet opening, and a rear peripheral region;
• a rotatable elbow configured to connect with the inlet opening;
• a mask seal formed of a material that is less rigid than the rigid material and comprising:
• a front peripheral region connected to the rear peripheral region of the mask base;
• a lip configured to lie against facial contours of a user, in use, the lip encircling an oral opening;
• a sidewall region positioned between the front peripheral region and the lip;
• an upper portion including one or more nasal openings and comprising:
• a flexing region including an upper surface configured to underlie a nose of a user, in use, and one or more nasal openings defined through the upper surface and;
• first and second upper support regions positioned on first and second sides, respectively, of the flexing region, wherein together, the first and second upper support regions and the flexing region form a valley configured to accommodate the nose of the user, in use, wherein the valley includes a forwardly disposed opening such that the valley is open from front to rear such that a tip of the nose of the user can protrude through the forward opening, in use, and wherein the first and second upper support regions are more rigid than the flexing region such that the first and second upper support regions help control a first ballooning action and flexing of the flexing region such that the first ballooning action is better directed toward the nose of the user, in use;
• first and second lower corners;
• a flexing chin region positioned between the first and second lower corners, wherein the flexing chin region wraps over at least a portion of the sidewall and extends upward and around at least a portion of the lip;
• first and second lower corner reinforcement regions positioned along the sidewall and the first and second lower corners of the seal and being stiffer than the flexing chin region, the first and second lower corner reinforcement regions wrapping around the first and second lower corners, respectively, and inwardly toward a generally vertical central plane that bisects the mask seal and toward the flexing chin region;
• wherein first and second lower corner reinforcement regions are configured to direct a second ballooning action of the mask seal and the flexing chin region is configured to deform to accommodate users having a wide variety of facial geometries, in use.