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 the user, said pillow section comprising: 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; and nasal pillows (250-1, 350-1), fluidically connected to said pillow gasket and adapted to substantially seal against the nostrils of the user in use, so that said stream of gases passes into said nasal pillows from said pillow gasket and is delivered to the user, each nasal pillow (250-1, 350-1) comprising a stem and a cap, characterised in that: the lower rear surface (500, 700) of said pillow gasket is shaped so that at least a portion of said lower rear surface (500,700) is concave when viewed directly from one side; and a wall surrounds the aperture, and the concave portion of said lower rear surface (500, 700) runs between the bases of the stems of said nasal pillows (250-1, 350-1) and a lower rear part of said wall, to ensure that contact between the user's face and the nasal pillow section (250, 350) occurs only at the nasal pillows (250-1, 350-1) during a majority of usage, and there is no or minimal contact in use with the upper lip of the user. 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; and nasal pillows (250-1, 350-1), fluidically connected to said pillow gasket and adapted to substantially seal against the nostrils of the user in use, so that said stream of gases passes into said nasal pillows from said pillow gasket and is delivered to the user, each nasal pillow (250-1, 350-1) comprising a stem and a cap, characterised in that: the lower rear surface (500, 700) of said pillow gasket is shaped so that at least a portion of said lower rear surface (500,700) is concave when viewed directly from one side; and a wall surrounds the aperture, and the concave portion of said lower rear surface (500, 700) runs between the bases of the stems of said nasal pillows (250-1, 350-1) and a lower rear part of said wall, to ensure that contact between the user's face and the nasal pillow section (250, 350) occurs only at the nasal pillows (250-1, 350-1) during a majority of usage, and there is no or minimal contact in use with the upper lip of the user. the lower rear surface (500, 700) of said pillow gasket is shaped so that at least a portion of said lower rear surface (500,700) is concave when viewed directly from one side; and a wall surrounds the aperture, and the concave portion of said lower rear surface (500, 700) runs between the bases of the stems of said nasal pillows (250-1, 350-1) and a lower rear part of said wall, to ensure that contact between the user's face and the nasal pillow section (250, 350) occurs only at the nasal pillows (250-1, 350-1) during a majority of usage, and there is no or minimal contact in use with the upper lip of the user.