A nasal pillow section (250, 350) for use as part of an apparatus for providing a stream of gases to a user, said pillow section in use located in front of the upper lip and below the nostrils of a user, said pillow section comprising, viewed from the front and to one side of the nasal pillow section being worn by the user who is standing up: a pillow gasket (250-2, 350-2), having: an open lower front portion and a lower rear surface (500, 700), wherein the open lower front portion acts as a gases aperture which receives a stream of gases in use, the open lower front portion comprising a wall which surrounds the open lower front portion for location against an open rear face of a manifold; the lower rear surface (500, 700) comprising a forward edge which is just behind the lowest part of the gases aperture; and nasal pillows (250-1, 350-1), the nasal pillows (250-1, 350-1) being fluidically connected to said pillow gasket (250-2, 350-2), and adapted to seal against the nostrils of a user in use, so that said stream of gases passes into said nasal pillows (250-1, 350-1) from said pillow gasket (250-2, 350-2) and is delivered to said user, characterized in that: the lower rear surface (500, 700) of said pillow gasket (250-2, 350-2) is concave so that in use, contact between the upper lip of a user and said pillow gasket (250-2, 350-2) is minimised; each nasal pillow (250-1, 350-1) comprises a cap, wherein the nasal pillows (250-1, 350-1) are angled rearwards towards one another; wherein the lower rear surface (500, 700) is at an angle to the vertical, so as to be forward sloping, with a lower edge of the lower rear surface (500, 700) forward of a rear edge of the lower rear surface (500, 700). a pillow gasket (250-2, 350-2), having: an open lower front portion and a lower rear surface (500, 700), wherein the open lower front portion acts as a gases aperture which receives a stream of gases in use, the open lower front portion comprising a wall which surrounds the open lower front portion for location against an open rear face of a manifold; the lower rear surface (500, 700) comprising a forward edge which is just behind the lowest part of the gases aperture; and nasal pillows (250-1, 350-1), the nasal pillows (250-1, 350-1) being fluidically connected to said pillow gasket (250-2, 350-2), and adapted to seal against the nostrils of a user in use, so that said stream of gases passes into said nasal pillows (250-1, 350-1) from said pillow gasket (250-2, 350-2) and is delivered to said user, characterized in that: the lower rear surface (500, 700) of said pillow gasket (250-2, 350-2) is concave so that in use, contact between the upper lip of a user and said pillow gasket (250-2, 350-2) is minimised; each nasal pillow (250-1, 350-1) comprises a cap, wherein the nasal pillows (250-1, 350-1) are angled rearwards towards one another; wherein the lower rear surface (500, 700) is at an angle to the vertical, so as to be forward sloping, with a lower edge of the lower rear surface (500, 700) forward of a rear edge of the lower rear surface (500, 700). the lower rear surface (500, 700) of said pillow gasket (250-2, 350-2) is concave so that in use, contact between the upper lip of a user and said pillow gasket (250-2, 350-2) is minimised; each nasal pillow (250-1, 350-1) comprises a cap, wherein the nasal pillows (250-1, 350-1) are angled rearwards towards one another; wherein the lower rear surface (500, 700) is at an angle to the vertical, so as to be forward sloping, with a lower edge of the lower rear surface (500, 700) forward of a rear edge of the lower rear surface (500, 700).