A nasal cannula for administering a breathable gas to a patient (or user), the nasal cannula comprising: a first section formed from a first material; a second section formed from a second material; and a side entry manifold with a manifold connection ; wherein the first section is softer than the second section, and the first section and second section are commensurately or complimentarily shaped or configured to communally receive the manifold connection for delivery of a source of gases to be delivered to a user, and wherein the nasal cannula comprises a body formed of the first section and the second section, the body defining an open cavity engageable by the manifold connection across a user's septum region in use, the first section comprising a cannula body portion defining at least in part said open cavity, said open cavity receivable of a supply of gases directed thereto via said manifold connection, the open cavity in fluid communication with one or a pair of nasal prongs , a rear portion of said body formed of the first section and being, in-use, substantially adjacent to the user's septum region, the rear portion being substantially compliant or deformable in response to a pressure applied by a user to said rear portion, wherein the rear portion defines at least a part of a rear wall of the open cavity, formed as a pillow section to be substantially adjacent to the user's septum region in-use, the rear portion being one or more of: a substantially thinned wall section of the body, or substantially elasticized, or elastically deformable, and wherein the second section provides for a structural or support or shape-defining, component part, of the nasal cannula. a first section formed from a first material; a second section formed from a second material; and a side entry manifold with a manifold connection ; wherein the first section is softer than the second section, and the first section and second section are commensurately or complimentarily shaped or configured to communally receive the manifold connection for delivery of a source of gases to be delivered to a user, and wherein the nasal cannula comprises a body formed of the first section and the second section, the body defining an open cavity engageable by the manifold connection across a user's septum region in use, the first section comprising a cannula body portion defining at least in part said open cavity, said open cavity receivable of a supply of gases directed thereto via said manifold connection, the open cavity in fluid communication with one or a pair of nasal prongs , a rear portion of said body formed of the first section and being, in-use, substantially adjacent to the user's septum region, the rear portion being substantially compliant or deformable in response to a pressure applied by a user to said rear portion, wherein the rear portion defines at least a part of a rear wall of the open cavity, formed as a pillow section to be substantially adjacent to the user's septum region in-use, the rear portion being one or more of: a substantially thinned wall section of the body, or substantially elasticized, or elastically deformable, and wherein the second section provides for a structural or support or shape-defining, component part, of the nasal cannula. <EOS>