A mask assembly for use as part of an apparatus for supplying a flow of respiratory gases to a user, comprising: a mask body having an inlet through which said flow of respiratory gases are provided to the interior of said mask body, the inlet adapted to be connected to a gases conduit, a mask seal assembly comprising a seal of flexible material and a clip of rigid material, the seal having a first side and a second side, the first side of the seal being shaped to approximately match the contours of a user's face and in use substantially seal against a user's face, the second side attached to said clip, the clip providing an interface extending substantially the full perimeter or periphery of the mask seal assembly for releasably attaching the mask seal assembly to the mask body, characterized in that: the clip comprises a bridging portion spanning outwards from the perimeter or periphery of the mask body to space at least a portion of the second side of the seal outwards from the perimeter or periphery of the mask body, and the mask assembly comprises an inner cushion (41, 541, 641, 741) located between the bridging portion of the clip and the first side of the seal, wherein the clip comprises a channel in the bridging portion, a first side of the inner cushion in use supporting the first side of the seal, and a second side of the inner cushion being received in the channel. a mask body having an inlet through which said flow of respiratory gases are provided to the interior of said mask body, the inlet adapted to be connected to a gases conduit, a mask seal assembly comprising a seal of flexible material and a clip of rigid material, the seal having a first side and a second side, the first side of the seal being shaped to approximately match the contours of a user's face and in use substantially seal against a user's face, the second side attached to said clip, the clip providing an interface extending substantially the full perimeter or periphery of the mask seal assembly for releasably attaching the mask seal assembly to the mask body, characterized in that: the clip comprises a bridging portion spanning outwards from the perimeter or periphery of the mask body to space at least a portion of the second side of the seal outwards from the perimeter or periphery of the mask body, and the mask assembly comprises an inner cushion (41, 541, 641, 741) located between the bridging portion of the clip and the first side of the seal, wherein the clip comprises a channel in the bridging portion, a first side of the inner cushion in use supporting the first side of the seal, and a second side of the inner cushion being received in the channel. the clip comprises a bridging portion spanning outwards from the perimeter or periphery of the mask body to space at least a portion of the second side of the seal outwards from the perimeter or periphery of the mask body, and the mask assembly comprises an inner cushion (41, 541, 641, 741) located between the bridging portion of the clip and the first side of the seal, wherein the clip comprises a channel in the bridging portion, a first side of the inner cushion in use supporting the first side of the seal, and a second side of the inner cushion being received in the channel.