Patient interface system

A cannula body for a respiratory interface for delivering breathable gas to the nares of a user, the cannula body comprising:

• a manifold having a pair of openings located on opposite lateral sides of the manifold, the openings being configured to permit gas flow to and from the cannula body,
• a pair of prongs extending from a manifold, each prong defining a lumen and having a wall with a first thickness;
• and
• wherein the manifold has a base region surrounding a junction between the pair of prongs and the manifold, the base region having a wall thickness less than the first thickness.