A patient interface to deliver a flow of air at a positive pressure with respect to ambient air pressure to an entrance to a patient's airways including at least the entrance of a patient's nares while the patient is sleeping, to ameliorate sleep disordered breathing, the patient interface comprising: a cushion forming at least part of a plenum chamber pressurizable to a therapeutic pressure, wherein the cushion comprises a seal-forming structure constructed and arranged to form a seal with a region of a patient's face surrounding the entrance to a patient's nares; and a positioning and stabilizing structure to provide a force to hold the seal-forming structure in a therapeutically effective position on a patient's head, the positioning and stabilizing structure comprising: a first headgear section and a second headgear section, each of the first and second headgear sections (3340, 3350) adapted to extend towards the cushion from a rear of the patient's head, each of the first and second headgear sections being configured to pass along a patient's cheek under a patient's eye between the patient's eye and ear; and a rear strap configured to engage the rear of the patient's head in use, wherein the first headgear section comprises a hollow tube configured to, in use, support the cushion in position on the patient's face and convey pressurized gas at the therapeutic pressure from the rear or crown of the patient's head to the cushion for breathing by the patient, wherein the first headgear section is not associated with a strap, and the second headgear section comprises a strap, wherein the strap is not configured to convey pressurized gas, characterized in that the second headgear section further comprises a buckle constructed and arranged to permit length adjustment of the loop formed by the first and second headgear sections (3340, 3350) together with the cushion and the second headgear section extends from the cushion to the buckle and the second headgear section includes an extension with a first end connected to the first headgear section and a second end that is threaded through the buckle to permit the length adjustment. a cushion forming at least part of a plenum chamber pressurizable to a therapeutic pressure, wherein the cushion comprises a seal-forming structure constructed and arranged to form a seal with a region of a patient's face surrounding the entrance to a patient's nares; and a positioning and stabilizing structure to provide a force to hold the seal-forming structure in a therapeutically effective position on a patient's head, the positioning and stabilizing structure comprising: a first headgear section and a second headgear section, each of the first and second headgear sections (3340, 3350) adapted to extend towards the cushion from a rear of the patient's head, each of the first and second headgear sections being configured to pass along a patient's cheek under a patient's eye between the patient's eye and ear; and a rear strap configured to engage the rear of the patient's head in use, wherein the first headgear section comprises a hollow tube configured to, in use, support the cushion in position on the patient's face and convey pressurized gas at the therapeutic pressure from the rear or crown of the patient's head to the cushion for breathing by the patient, wherein the first headgear section is not associated with a strap, and the second headgear section comprises a strap, wherein the strap is not configured to convey pressurized gas, a first headgear section and a second headgear section, each of the first and second headgear sections (3340, 3350) adapted to extend towards the cushion from a rear of the patient's head, each of the first and second headgear sections being configured to pass along a patient's cheek under a patient's eye between the patient's eye and ear; and a rear strap configured to engage the rear of the patient's head in use, wherein the first headgear section comprises a hollow tube configured to, in use, support the cushion in position on the patient's face and convey pressurized gas at the therapeutic pressure from the rear or crown of the patient's head to the cushion for breathing by the patient, wherein the first headgear section is not associated with a strap, and the second headgear section comprises a strap, wherein the strap is not configured to convey pressurized gas, characterized in that the second headgear section further comprises a buckle constructed and arranged to permit length adjustment of the loop formed by the first and second headgear sections (3340, 3350) together with the cushion and the second headgear section extends from the cushion to the buckle and the second headgear section includes an extension with a first end connected to the first headgear section and a second end that is threaded through the buckle to permit the length adjustment. the second headgear section further comprises a buckle constructed and arranged to permit length adjustment of the loop formed by the first and second headgear sections (3340, 3350) together with the cushion and the second headgear section extends from the cushion to the buckle and the second headgear section includes an extension with a first end connected to the first headgear section and a second end that is threaded through the buckle to permit the length adjustment.