A respiratory mask for supplying an inhalation fluid to the airways of a user, the respiratory mask comprising: a body (10) generally concave and having a peripheral edge, the body (10) being adapted to provide a cavity during use around the mouth and nose of a user, such that the inhalation gas can be inhaled by the user from the cavity, the body having an inlet (13) that can be coupled with a supply of inhalation gas and is in communication with the cavity； and, an elastic seal formation (20) that depends on at least a portion of the peripheral edge, the elastic seal formation (20) comprising both a first and a second flange portion (22,28) relative to the peripheral edge of the body, the first flange portion (22) that depends internally from the peripheral edge of the body (10) in the cavity and the second flange portion (28) that depends externally from the peripheral edge of the body (10)； the first flange portion (22) being arranged to pass shortly below the jaw of a user having a lower total facial height, providing, during use, a seal around the jaw for users who have a total facial height , such that its nose and lower jaw can be located inside the peripheral edge of the mask, and characterized in that the second (28) flange portion is arranged to pass shortly below the jaw of a user having a height larger total facial, providing, during use, a seal around the jaw for users who have a total facial height, such that their nose and lower jaw cannot be located within the peripheral edge of the mask, in where the second flange portion (28) is concave in the same manner as the body of the mask, in order to provide a chin pa ra a user who has a higher total facial height.Una mascarilla respiratoria para suministrar un fluido de inhalación a las vías respiratorias de un usuario, la mascarilla respiratoria que comprende: un cuerpo (10) de forma generalmente cóncava y que tiene un borde periférico, el cuerpo (10) estando adaptado para proporcionar una cavidad durant
