A prosthetic valve has an annular frame including a plurality of strut members that is radially collapsible to a collapsed configuration and radially expandable to an expanded configuration. A leaflet structure is situated at least partially within the frame. The leaflet structure includes a plurality of leaflets, each leaflet having opposing commissure tab portions on opposite sides of the leaflet. Each commissure tab portion is paired with an adjacent commissure tab portion of an adjacent leaflet to form a commissure. The commissure tab portions of each leaflet are folded to form a plurality of layers positioned on the inside of the frame. A reinforcement member is positioned between the layers of each commissure tab portion.