Disclosed is a CPAP facial mask for assisting with sleep apnoea or other breathing obstruction conditions. The patient interface system provides breathable gas to a patient, with a cushion assembly of a nasal cushion to define a nasal gas chamber； an oral cushion to define an oral gas chamber distinct from said nasal gas chamber； and a decoupling structure disposed between the nasal cushion and the oral cushion. A positioning and stabilizing structure has a pair of lower side straps； and a pair of lower clips configured to releasably attach a corresponding one of the pair of lower side straps of the positioning and stabilizing structure to the cushion assembly. Each of the pair of lower attachment features is made from a thermoplastic elastomer and each of the pair of lower attachment features has a first magnet embedded inside. A faceplate is fixed to the oral cushion； and a frame releasably attachable to the faceplate, where the pair of lower attachment features are fixed to the frame. The frame is more rigid than the lower attachment features. The pair of lower attachment features are molded onto the frame.
