Nasal cannula

A nasal cannula for delivering a flow of gases to at least one nare of a user, the nasal cannula comprising:

• an asymmetric profile, the asymmetric profile configured to reduce an amount of occlusion of one nare of the user;
• a frame or manifold part including a first arm and a second arm, wherein the first the first arm extends in a first direction from a medial portion to a first lateral end, wherein the second arm extends in a second direction from the medial portion to a second lateral end, wherein the first and the second directions are opposite directions, and wherein the frame or manifold part has a thickness extending between a back side of the cannula and a front side of the cannula, the back side of the cannula being located against or adjacent a face of the user, the front side of the cannula facing outward and opposite the back side of the cannula, and wherein the thickness of the first arm is smaller than the thickness of the second arm such that the first arm and the second arm is asymmetric in a plan view, and wherein the thickness of the first arm includes a taper wherein the thickness decreases and wherein the taper terminates prior to the lateral end of the first arm;
• a first nasal prong;
• and
• a second nasal prong, wherein the first arm extends away from the first nasal prong and the second arm extends away from the second nasal prong in an opposite direction from the first arm, and wherein the first nasal prong has a different cross-sectional shape than a cross-sectional shape of the second nasal prong.