Patient interface

A patient interface to deliver pressurized gas to a patient to treat sleep disordered breathing, the patient interface comprising:

• a seal-forming structure having a nasal opening to provide pressurized gas to both nares of the patient and a plenum chamber formed in one piece, the plenum chamber including a plenum connection region, and the seal-forming structure is configured to seal around an inferior periphery of the patient's nose and at or near the tip of the patient's nose;
• a frame releasably attachable to the plenum connection region;
• a connection port formed in one piece with the frame;
• and
• a gas delivery tube permanently joined to the frame at the connection port, the gas delivery tube comprising:
• a helical coil comprised of a plurality of adjacent coils, each coil separated by a width and having an outer surface defining a coil diameter;
• and
• a web of material coaxial to the helical coil attached to the helical coil between adjacent ones of the plurality of adjacent coils and having at least one fold extending radially outward between adjacent ones of the plurality of adjacent coils, the at least one fold defined by a predetermined fold line.