A patient interface for sealed delivery of a flow of breathable gas at a continuously positive pressure with respect to ambient air pressure to an entrance of a patient's nasal airways only, wherein the patient interface is configured to maintain a therapy pressure in a range of about 4cmH 2 O to about 30 cmH2O above ambient air pressure in use, throughout the patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing; said patient interface comprising: a cushion assembly including a seal-forming structure adapted to form a seal against the patient's airways and a plenum chamber pressurised at a pressure above ambient pressure in use; a positioning and stabilising structure to maintain the cushion assembly in sealing contact with an area surrounding the entrance to the patient's nasal airways while maintaining the therapeutic pressure at the entrance to the patient's nasal airways, the positioning and stabilising structure comprising upper headgear straps; and a frame assembly comprising: a ring member; lower arms extending from lower arm connection points radially positioned on the ring member; a joining member extending posteriorly from the ring member at an upper position on the ring member; and upper arms extending from an upper arm connection point at a distal end of the joining member such that the lower arm connection points are in a position anterior from the upper arm connection point, the upper arms adapted to extend over the cheeks of the patient in use; wherein the lower arms provide lower headgear connection points; wherein the upper arms provide upper headgear connection points releasably engageable with the upper headgear straps; wherein the upper arm connection point is posterior from the lower arm connection points at a predetermined distance, wherein the joining member in part provides that the upper arm connection point is posterior from the lower arm connection points, wherein, between the upper arm connection point and the lower arm connection points, a moment arm is defined by the upper arm connection point being posterior from the lower arm connection points which provides a maximum tilting range for the frame assembly relative to the patient's face, wherein a center of rotation or pivot point of the frame assembly is defined at a lower side of the frame assembly when the upper headgear straps are adjusted or tightened in use, wherein the upper arms are configured to direct, in use, a tension vector of the upper headgear straps in a direction parallel to the Frankfort horizontal direction and avoid extending across the patient's ears. a cushion assembly including a seal-forming structure adapted to form a seal against the patient's airways and a plenum chamber pressurised at a pressure above ambient pressure in use; a positioning and stabilising structure to maintain the cushion assembly in sealing contact with an area surrounding the entrance to the patient's nasal airways while maintaining the therapeutic pressure at the entrance to the patient's nasal airways, the positioning and stabilising structure comprising upper headgear straps; and a frame assembly comprising: a ring member; lower arms extending from lower arm connection points radially positioned on the ring member; a joining member extending posteriorly from the ring member at an upper position on the ring member; and upper arms extending from an upper arm connection point at a distal end of the joining member such that the lower arm connection points are in a position anterior from the upper arm connection point, the upper arms adapted to extend over the cheeks of the patient in use; a ring member; lower arms extending from lower arm connection points radially positioned on the ring member; a joining member extending posteriorly from the ring member at an upper position on the ring member; and upper arms extending from an upper arm connection point at a distal end of the joining member such that the lower arm connection points are in a position anterior from the upper arm connection point, the upper arms adapted to extend over the cheeks of the patient in use; wherein the lower arms provide lower headgear connection points; wherein the upper arms provide upper headgear connection points releasably engageable with the upper headgear straps; wherein the upper arm connection point is posterior from the lower arm connection points at a predetermined distance, wherein the joining member in part provides that the upper arm connection point is posterior from the lower arm connection points, wherein, between the upper arm connection point and the lower arm connection points, a moment arm is defined by the upper arm connection point being posterior from the lower arm connection points which provides a maximum tilting range for the frame assembly relative to the patient's face, wherein a center of rotation or pivot point of the frame assembly is defined at a lower side of the frame assembly when the upper headgear straps are adjusted or tightened in use, wherein the upper arms are configured to direct, in use, a tension vector of the upper headgear straps in a direction parallel to the Frankfort horizontal direction and avoid extending across the patient's ears.