A mask system for delivering pressurized breathable gas to a patient for treatment of sleep disordered breathing, comprising a chamber forming portion including at least a first panel (20-1) comprising a coated textile and having an opening formed therein, the coated textile including a first layer of fabric and a second layer of silicone, the first panel at least partially delimiting a cavity; and a seal member formed as part of the first panel and configured to sealingly engage the patient's face.