Patient interface

A patient interface for providing a flow of air at a therapeutic pressure above ambient air pressure to a patient throughout the patient's respiratory cycle to treat sleep disordered breathing, the patient interface comprising:

• a frame constructed from a first material, the frame having a connection port, and the frame having a first group of vent holes positioned on a first lateral side of the connection port and a second group of vent holes positioned on a second lateral side of the connection port that is opposite the first lateral side;
• a seal-forming structure removably connected to the frame to at least partly form a gas chamber, the seal-forming structure being configured to contact and seal against the patient's face to deliver the flow of air to the patient's nares during use, the seal-forming structure being configured to leave the patient's mouth uncovered in use, and the seal-forming structure being constructed from a second material that is more flexible than the first material;
• a tube connected to the frame at the connection port without an elbow and configured to direct the flow of air into the gas chamber for breathing by the patient;
• a pair of rigidizer arms constructed from a third material that is more flexible than the first material and less flexible than the second material, each of the rigidizer arms being connected to the frame;
• and
• a strap constructed from a textile material, the strap having a pair of length-adjustable side strap portions, each of the length-adjustable side strap portions being removably connected to a corresponding one of the rigidizer arms, the strap having a length-adjustable top strap portion positioned between and connected to each of the length-adjustable side strap portions, the strap having a back strap portion positioned between and connected to each of the length-adjustable side strap portions, and a gap being formed between the length-adjustable top strap portion and the back strap portion.