An absorbent feminine hygiene article, comprising a topsheet comprising a liquid permeable topsheet web material, a backsheet comprising a substantially liquid impermeable backsheet web material, and an absorbent core structure disposed between the topsheet and backsheet, the absorbent core structure having oppositely-disposed left and right side edges and associated respective left and right core 1⁄4 length chord lines, wherein the 1⁄4 length chord lines are identified by dividing the length L of the absorbent core structure equally into four equal sub-lengths 1⁄4 L, and identifying intersections between the lateral one-quarter and three-quarter length-dividing lines and the respective left and right longitudinal edges of the absorbent core structure; the article also comprising a pair of oppositely-disposed left and right side extensions, each side extension extending laterally away from one of the side edges of the absorbent core structure, wherein: each side extension comprises an extension portion of web material that is either integral and continuous with one or both of the topsheet and backsheet web materials, or is directly or indirectly attached to at least one of the topsheet and backsheet web materials; each side extension comprises a longitudinal flexure zone and an outboard zone, the outboard zone comprising a supplementary structure having an inboard supplementary structure tangent line parallel to a nearest of the left and right core 1⁄4 length chord lines, the longitudinal flexure zone being bounded at least in part by the inboard supplementary structure tangent line and the nearest of the 1⁄4 length chord lines; the outboard zone being that portion of the side extension lying outboard of the inboard supplementary structure tangent line; the outboard zone comprising a supplemented zone bounded by an outer plan profile of the supplementary structure; the longitudinal flexure zone has a first basis weight, and the supplemented zone has a second basis weight that is at least 10 percent, more preferably at least 15 percent, still more preferably at least 20 percent, and even more preferably at least 25 percent greater than the first basis weight; and the supplemented zone has a side extension adhesive patch disposed at least in part thereon, the side extension adhesive patch being distinct from the supplementary structure, wherein the side extension adhesive patch is disposed entirely within the supplemented zone. each side extension comprises an extension portion of web material that is either integral and continuous with one or both of the topsheet and backsheet web materials, or is directly or indirectly attached to at least one of the topsheet and backsheet web materials; each side extension comprises a longitudinal flexure zone and an outboard zone, the outboard zone comprising a supplementary structure having an inboard supplementary structure tangent line parallel to a nearest of the left and right core 1⁄4 length chord lines, the longitudinal flexure zone being bounded at least in part by the inboard supplementary structure tangent line and the nearest of the 1⁄4 length chord lines; the outboard zone being that portion of the side extension lying outboard of the inboard supplementary structure tangent line; the outboard zone comprising a supplemented zone bounded by an outer plan profile of the supplementary structure; the longitudinal flexure zone has a first basis weight, and the supplemented zone has a second basis weight that is at least 10 percent, more preferably at least 15 percent, still more preferably at least 20 percent, and even more preferably at least 25 percent greater than the first basis weight; and the supplemented zone has a side extension adhesive patch disposed at least in part thereon, the side extension adhesive patch being distinct from the supplementary structure, wherein the side extension adhesive patch is disposed entirely within the supplemented zone.