A sealing interface for use as part of an apparatus for supplying a flow of respiratory gases to a user, comprising: an inner cushion (101, 201), an outer sheath adapted to substantially seal against the facial contours of the user, said inner cushion (101, 201) and said outer sheath shaped to approximately follow the contours of a patient's face, each having a nasal bridge region, left and right cheek regions (104, 204) and either one of an upper lip region or a chin region, in use said regions being aligned with the corresponding nasal bridge region, left and right cheek regions (104, 204) and either the upper lip region or the chin region of a user, characterised in that: the nasal bridge region or the chin region of the inner cushion (101, 201) is a hinged region (103, 205) adapted to flex substantially independently of said inner cushion cheek regions (104, 204), wherein said hinged region (103, 205) is coupled to each said cheek region by a hinging portion (107, 207) so that the hinged region (103, 205) flexes, pivots or bends about the hinging portion (107, 207), and each said hinging portion (107, 207) is a narrow necked section (107, 207) formed between said hinged region (103, 205) and a corresponding said cheek region (104, 204), said hinged region (103, 205) and cheek regions (104, 204) being integrally formed, and wherein said narrow necked section (107, 207) is formed by a notch (109, 110, 113) or a slit (112, 114) in a side of the inner cushion (101, 201) that faces the user's face in use. an inner cushion (101, 201), an outer sheath adapted to substantially seal against the facial contours of the user, said inner cushion (101, 201) and said outer sheath shaped to approximately follow the contours of a patient's face, each having a nasal bridge region, left and right cheek regions (104, 204) and either one of an upper lip region or a chin region, in use said regions being aligned with the corresponding nasal bridge region, left and right cheek regions (104, 204) and either the upper lip region or the chin region of a user, characterised in that: the nasal bridge region or the chin region of the inner cushion (101, 201) is a hinged region (103, 205) adapted to flex substantially independently of said inner cushion cheek regions (104, 204), wherein said hinged region (103, 205) is coupled to each said cheek region by a hinging portion (107, 207) so that the hinged region (103, 205) flexes, pivots or bends about the hinging portion (107, 207), and each said hinging portion (107, 207) is a narrow necked section (107, 207) formed between said hinged region (103, 205) and a corresponding said cheek region (104, 204), said hinged region (103, 205) and cheek regions (104, 204) being integrally formed, and wherein said narrow necked section (107, 207) is formed by a notch (109, 110, 113) or a slit (112, 114) in a side of the inner cushion (101, 201) that faces the user's face in use. the nasal bridge region or the chin region of the inner cushion (101, 201) is a hinged region (103, 205) adapted to flex substantially independently of said inner cushion cheek regions (104, 204), wherein said hinged region (103, 205) is coupled to each said cheek region by a hinging portion (107, 207) so that the hinged region (103, 205) flexes, pivots or bends about the hinging portion (107, 207), and each said hinging portion (107, 207) is a narrow necked section (107, 207) formed between said hinged region (103, 205) and a corresponding said cheek region (104, 204), said hinged region (103, 205) and cheek regions (104, 204) being integrally formed, and wherein said narrow necked section (107, 207) is formed by a notch (109, 110, 113) or a slit (112, 114) in a side of the inner cushion (101, 201) that faces the user's face in use.