An article of footwear is disclosed that includes at least one of a Stretchable upper and an articulated sole structure . The sole structure may include a connecting portion and a plurality of discrete sole elements . The connecting portion is positioned adjacent the upper and may extend along a longitudinal length of the upper. The sole elements extend from the connecting portion, and the sole elements are separated by a plurality of sipes that extend upward into the sole structure. Said sipes are obtained during molding by locating a plurality of blades around which a polymer material is placed to form the midsole.