Mask system with snap-fit shroud

A mask system comprising:

• a cushion module comprising:
• a cushion constructed of a flexible material to form a seal with a patient's face in use, wherein the cushion is constructed to engage along a nasal bridge region of the patient's lace when in use, the cushion including a concertina section provided in a nasal bridge region of the cushion, the concertina section including one or more folds that provide a degree of flexibility or movement to the cushion, and
• a frame connected to the cushion and forming a breathing chamber, the frame constructed from a more rigid material than the cushion, and the frame including a circular frame opening configured to in-use allow a flow of breathable gas into the breathing chamber;
• a shroud module constructed from a more rigid material than the cushion and including a circular opening, the shroud module including a forehead support, and the shroud module including headgear connectors, wherein an underside of the shroud module faces the breathing chamber and includes a protrusion structured to be received within a slot on the frame, the protrusion being spaced inboard of an outer edge of the shroud module and extending towards the breathing chamber when received within the slot, an exterior of the shroud module structured to cover the protrusion and the slot when the protrusion is received in the slot;
• headgear for holding the cushion module in a sealing position in order to enable the flow of breathable gas at positive pressure to be delivered to the patient's airways, the headgear including a pair of upper straps adapted to contact the patient's head superior to the patient's ears and a pair of lower straps adapted to contact the patient's head inferior to the patient's ears, the pair of upper straps and the pair of lower straps removably connected to the shroud module;
• and
• an elbow module constructed from a more rigid material than the cushion, the elbow module comprising:
• a first end being rotatably engaged with the shroud module to allow for 360° of relative rotation between the elbow module and the shroud module, and
• a second end adapted to be connected to an air delivery tube to deliver breathable gas to the patient.