A sole structure for an article of footwear (100, 800, 1400), comprising: a first footwear component (400, 802) including a ground-facing surface (400G, 802G), wherein a forefoot portion of the ground-facing surface (400G, 802G) includes: (a) an arched medial surface arching downward from a medial side edge of the sole structure toward a central region of the first footwear component (400, 802), and (b) an arched lateral surface arching downward from a lateral side edge of the sole structure toward the central region of the first footwear component (400, 802), wherein the first footwear component (400, 802) includes one of a first track (402T, 1710T, 2000T) or a first channel (902T, 1710C); and a second footwear component (500, 1000) including an upper-facing surface, wherein a forefoot portion of the upper-facing surface includes: (a) an arched medial surface arching downward from a medial side edge of the second footwear component (500, 1000) toward a central region of the second footwear component (500, 1000) and facing the arched medial surface of the first footwear component (400, 802), and (b) an arched lateral surface arching downward from a lateral side edge of the second footwear component (500, 1000) toward the central region of the second footwear component (500, 1000) and facing the arched lateral surface of the first footwear component (400, 802), wherein the second footwear component (500, 1000) includes the other of the first track or the first channel (500T, 1810C, +1810X, 2000C), wherein the first track is engaged with the first channel, and wherein the first footwear component (400, 802) is movably engaged with the second footwear component (500, 1000) by movement of the first channel with respect to the first track. a first footwear component (400, 802) including a ground-facing surface (400G, 802G), wherein a forefoot portion of the ground-facing surface (400G, 802G) includes: (a) an arched medial surface arching downward from a medial side edge of the sole structure toward a central region of the first footwear component (400, 802), and (b) an arched lateral surface arching downward from a lateral side edge of the sole structure toward the central region of the first footwear component (400, 802), wherein the first footwear component (400, 802) includes one of a first track (402T, 1710T, 2000T) or a first channel (902T, 1710C); and a second footwear component (500, 1000) including an upper-facing surface, wherein a forefoot portion of the upper-facing surface includes: (a) an arched medial surface arching downward from a medial side edge of the second footwear component (500, 1000) toward a central region of the second footwear component (500, 1000) and facing the arched medial surface of the first footwear component (400, 802), and (b) an arched lateral surface arching downward from a lateral side edge of the second footwear component (500, 1000) toward the central region of the second footwear component (500, 1000) and facing the arched lateral surface of the first footwear component (400, 802), wherein the second footwear component (500, 1000) includes the other of the first track or the first channel (500T, 1810C, +1810X, 2000C), wherein the first track is engaged with the first channel, and wherein the first footwear component (400, 802) is movably engaged with the second footwear component (500, 1000) by movement of the first channel with respect to the first track.