A prosthetic heart valve, comprising: a collapsible and expandable stent having a proximal end, a distal end, an annulus section adjacent the proximal end and an aortic section adjacent the distal end; a plurality of commissure features (116, 600) disposed on the stent; and a collapsible and expandable valve assembly, the valve assembly including a plurality of leaflets (108, 850) connected to the plurality of commissure features (116, 600); wherein each commissure feature (116, 600) includes a body having a longitudinal direction extending a height between a proximal end and a distal end, and a plurality of eyelets in the body arranged in at least two rows and at least two columns for distributing load from the plurality of leaflets (108, 850), each column extending in the longitudinal direction, the body having a width in a direction orthogonal to the longitudinal direction, and each of the plurality of leaflets has a top free edge for coapting with others of the leaflets and characterised by each of the plurality of leaflets including only a single rectangular tab foldable upon itself along a fold line and being capable of attaching to a commissure feature (116, 600) at a leaflet-commissure feature junction, the single rectangular tab having a width which is at least as long as the width of the body, and a height which is at least as long as the height of the body, the single rectangular tab being positioned on only a first side of the leaflet, each of the plurality of leaflets (108, 850) also including one flap coupled to a top of the single rectangular tab at the first side of the leaflet, and a second flap coupled to the top free edge of the leaflet (108, 850) at an opposite second side of the leaflet. a collapsible and expandable stent having a proximal end, a distal end, an annulus section adjacent the proximal end and an aortic section adjacent the distal end; a plurality of commissure features (116, 600) disposed on the stent; and a collapsible and expandable valve assembly, the valve assembly including a plurality of leaflets (108, 850) connected to the plurality of commissure features (116, 600); wherein each commissure feature (116, 600) includes a body having a longitudinal direction extending a height between a proximal end and a distal end, and a plurality of eyelets in the body arranged in at least two rows and at least two columns for distributing load from the plurality of leaflets (108, 850), each column extending in the longitudinal direction, the body having a width in a direction orthogonal to the longitudinal direction, and each of the plurality of leaflets has a top free edge for coapting with others of the leaflets and characterised by each of the plurality of leaflets including only a single rectangular tab foldable upon itself along a fold line and being capable of attaching to a commissure feature (116, 600) at a leaflet-commissure feature junction, the single rectangular tab having a width which is at least as long as the width of the body, and a height which is at least as long as the height of the body, the single rectangular tab being positioned on only a first side of the leaflet, each of the plurality of leaflets (108, 850) also including one flap coupled to a top of the single rectangular tab at the first side of the leaflet, and a second flap coupled to the top free edge of the leaflet (108, 850) at an opposite second side of the leaflet.