A patient interface for delivering breathable gas to a patient includes a nasal prong assembly (22) including a pair of nasal prongs (24) structured to sealingly communicate with nasal passages of a patient's nose in use and headgear (25) to maintain the nasal prong assembly in a desired position on the patient's face. The headgear includes side straps (53) and rigidizers (52) provided to respective side straps. Each rigidizer includes a first end portion that provides a connector (56) structured to engage a respective end of the nasal prong assembly and an inwardly curved protrusion (63) in the form of a cheek support that curves inwardly of the connector. The cheek support is adapted to follow the contour of the patient's cheek and guide a respective end portion of the side strap into engagement with the patient's cheek to provide a stable cheek support.
