Cushion assembly for a respiratory mask

A mask assembly for a respiratory treatment apparatus comprising:

• a mask frame, the mask frame including a port for coupling with a gas supply tube configured for pneumatic coupling with a flow generator, the gas supply tube for providing treatment air of a respiratory therapy, via the mask assembly, to a patient's respiratory system;
• and
• a cushion coupled with the mask frame, the cushion comprising an inner cushion component and a patient contact side portion, the patient contact portion comprising a chamber and a barrier to form the chamber, the chamber comprising an outer layer with respect to the inner cushion component,
• wherein the cushion further comprises a chamber supply orifice,
• and wherein the mask frame further comprises a chamber supply duct coupled for gas flow to the chamber supply orifice, the chamber supply duct being pneumatically coupled to the gas supply tube to receive the treatment air.