An articulated sole structure (604; 704) comprising: a footwear sole structure spanning portion extending longitudinally along the length of the sole structure (604; 704) and transversely between the medial and lateral sides of the sole structure; and an articulated portion (616; 710) located below the spanning portion and comprising a plurality of sipes (630, 632) extending upward into the articulated portion (616; 710) from a bottom surface (612; 720) of the articulated portion (616; 710) and forming a hexagonal pattern on the bottom surface (612; 720) of the articulated portion (616; 710), and a plurality of discrete hexagonally-shaped sole elements extending downward from the spanning portion, wherein individual hexagonally-shaped sole elements are at least partially defined by one or more sipes of the plurality of sipes (630, 632); characterized by a curved sipe (619a-b; 708a-b) located at least partially above the articulated portion (616; 710) and extending sideward into a side of the articulated sole structure (604; 704), wherein the curved sipe (619a-b; 708a-b) extends along the side of the articulated sole structure (604; 704) through at least a portion of a heel region, through a midfoot region, and through at least a portion of a forefoot region of the articulated sole structure (604; 704), wherein a first sipe depth of one or more sipes (630, 632) located in a forefoot region and of one or more sipes (630, 632) located in a heel region of the sole structure (604; 704) is greater than a second sipe depth of one or more sipes (630, 632) located in a forefoot region of the sole structure (604; 704); a plurality of hexagonal lugs extending downward from the bottom surface (612; 720) of the articulated sole portion, wherein individual hexagonal lugs of the plurality of hexagonal lugs are connected to and extend downward from one of the hexagonal sole elements. a footwear sole structure spanning portion extending longitudinally along the length of the sole structure (604; 704) and transversely between the medial and lateral sides of the sole structure; and an articulated portion (616; 710) located below the spanning portion and comprising a plurality of sipes (630, 632) extending upward into the articulated portion (616; 710) from a bottom surface (612; 720) of the articulated portion (616; 710) and forming a hexagonal pattern on the bottom surface (612; 720) of the articulated portion (616; 710), and a plurality of discrete hexagonally-shaped sole elements extending downward from the spanning portion, wherein individual hexagonally-shaped sole elements are at least partially defined by one or more sipes of the plurality of sipes (630, 632); a plurality of sipes (630, 632) extending upward into the articulated portion (616; 710) from a bottom surface (612; 720) of the articulated portion (616; 710) and forming a hexagonal pattern on the bottom surface (612; 720) of the articulated portion (616; 710), and a plurality of discrete hexagonally-shaped sole elements extending downward from the spanning portion, wherein individual hexagonally-shaped sole elements are at least partially defined by one or more sipes of the plurality of sipes (630, 632); characterized by a curved sipe (619a-b; 708a-b) located at least partially above the articulated portion (616; 710) and extending sideward into a side of the articulated sole structure (604; 704), wherein the curved sipe (619a-b; 708a-b) extends along the side of the articulated sole structure (604; 704) through at least a portion of a heel region, through a midfoot region, and through at least a portion of a forefoot region of the articulated sole structure (604; 704), wherein a first sipe depth of one or more sipes (630, 632) located in a forefoot region and of one or more sipes (630, 632) located in a heel region of the sole structure (604; 704) is greater than a second sipe depth of one or more sipes (630, 632) located in a forefoot region of the sole structure (604; 704); a plurality of hexagonal lugs extending downward from the bottom surface (612; 720) of the articulated sole portion, wherein individual hexagonal lugs of the plurality of hexagonal lugs are connected to and extend downward from one of the hexagonal sole elements.