A nasal dilator device comprises a substantially U-shaped body including a central portion arranged to span a septum of a nose when worn by a user and first and second leg members extending from the central portion in a first plane. The device further comprises a first cantilever rib member extending outward from the U-shaped body in a second plane and a second cantilever rib member extending outward from the U-shaped body in a third plane, wherein the first and second cantilever rib members extend away from each other. The device further comprises a first intermediate section connecting an end of the first leg member to a proximal end of the first cantilever rib member, wherein the first intermediate section extends between the first plane and second plane and a second intermediate section connecting an end of the second leg member to a proximal end of the second cantilever rib member, wherein the second intermediate section extends between the first plane and the third plane.