An article of footwear that includes an upper that secures the article of footwear to a wearer. The footwear also includes a sole assembly that is operably coupled to the upper. The sole assembly includes an outsole having a plurality of cleats and a groove. The groove includes a first internal surface and a second internal surface. The first and second internal surfaces move away from each other as the sole assembly flexes in a first direction, and the first and second internal surfaces abut each other to limit movement of the sole assembly in a second direction opposite the first direction.