Textile seal with silicone layer

A cushion assembly for interfacing with a patient's airways including at least the patient's nares, the cushion assembly being configured to maintain a therapy pressure above ambient air pressure in use, throughout a patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, said cushion assembly comprising:

• a plenum chamber at least partially forming a cavity pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure, said plenum chamber including a plenum chamber inlet port sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient;
• and
• a seal-forming structure having a textile membrane constructed and arranged to form a pressure-assisted seal with a region of the patient's face surrounding an entrance to the patient's airways inferior to a nasal bridge region of the patient's face, said textile membrane having a hole formed therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the cavity throughout the patient's respiratory cycle in use,
• wherein the textile membrane includes a textile material adapted to contact the patient's face and an air impermeable silicone layer applied thereto, the textile material comprising 1) nylon and/or polyester, and 2) elastane,
• wherein a yarn count of the nylon and/or polyester is in a range of 20-80 denier,
• wherein the textile membrane has stretchability in both a direction of the wales and a direction of the course, and the air impermeable silicone layer facilitates the stretchability of the textile membrane, and
• wherein a thickness of the air impermeable silicone layer is in the range of 0.04 mm to 0.125 mm.