A frame for use in an interface device having a sealing assembly for delivering a flow of treatment gas to the airway of a patient, the frame comprising: a first frame member having a first end structured to be coupled to a conduit supplying the flow of treatment gas and an opposite second end structured to be coupled to the sealing assembly, the first frame member having a passage defined therein which extends between the first end and the second end thereof; a second frame member having a first end structured to be coupled to the conduit supplying the flow of treatment gas and an opposite second end structured to be coupled to the sealing assembly, the second frame member having a passage defined therein which extends between the first end and the second end thereof; and a strap coupled between the first frame member and the second frame member, wherein the strap comprises a first end and an opposite second end , wherein the first end of the strap is coupled to the first frame member at a location between the first end and the second end of the first frame member, and wherein the second end of the strap is coupled to the second frame member at a location between the first end and the second end of the second frame member; wherein the first frame member is disposed on a first side of a reference plane (P) which passes through the sealing assembly and the second frame member is disposed on a second side of the reference plane opposite the first side, and characterized in that the strap serves to bias at least one of the first frame member and the second frame member toward the other of the first frame member and the second frame member, and the strap is formed from an elastic material such that the strap acts like a spring. a first frame member having a first end structured to be coupled to a conduit supplying the flow of treatment gas and an opposite second end structured to be coupled to the sealing assembly, the first frame member having a passage defined therein which extends between the first end and the second end thereof; a second frame member having a first end structured to be coupled to the conduit supplying the flow of treatment gas and an opposite second end structured to be coupled to the sealing assembly, the second frame member having a passage defined therein which extends between the first end and the second end thereof; and a strap coupled between the first frame member and the second frame member, wherein the strap comprises a first end and an opposite second end , wherein the first end of the strap is coupled to the first frame member at a location between the first end and the second end of the first frame member, and wherein the second end of the strap is coupled to the second frame member at a location between the first end and the second end of the second frame member; wherein the first frame member is disposed on a first side of a reference plane (P) which passes through the sealing assembly and the second frame member is disposed on a second side of the reference plane opposite the first side, and characterized in that the strap serves to bias at least one of the first frame member and the second frame member toward the other of the first frame member and the second frame member, and the strap is formed from an elastic material such that the strap acts like a spring. <EOS>