Abstract: An article of footwear may have a sole including an outer member having an outer surface and an inner surface disposed closer to a wearer's foot than the outer surface. The outer member may include at least a first flex groove formed as an elongate recess in a first flex groove region, causing both the inner surface and the outer surface of the outer member to curve upward. The sole may include a reinforcing member disposed closer to the wearer's foot than the outer member, and may be relatively more rigid than the outer member. The reinforcing member may include a first bridge portion disposed in the first flex groove region and joining the first portion and the second portion together. The lateral width of the first bridge portion may be less than the lateral width of the first portion, and less than the lateral width of the second portion.

Abstract: An article of footwear may include a sole having a lower surface. A forefoot region may include a first forefoot section and a second forefoot section separated by a first flex groove. The first flex groove may be formed by an upwardly extending elongate recess in the lower surface of the sole. In addition, the first forefoot section may include a first set of ground engaging members extending substantially downward, the first set of ground engaging members forming a substantially arcuate first arrangement. Also, the second forefoot section may include a second set of ground engaging members extending substantially downward, the second set of ground engaging members forming a substantially arcuate second arrangement. The first arrangement may be curved in a different direction than the second arrangement. Each ground engaging member of the first set of ground engaging members may have a length extending along an arc.