Patent ID: 7444767

Claim:
An article of footwear comprising, in combination: an upper; a sole assembly secured to the upper and comprising: a central member formed of a first material having a first density, a medial side of the central member having a first surface irregularity, a lateral side of the central member having a second surface irregularity; a medial member extending along a portion of the medial side of the central member and extending only partially beneath a portion of the central member and having a surface irregularity configured to mate and interlock with the first surface irregularity of the central member, the medial member being formed of a second material having a density greater than the first density; and a lateral member extending along a portion of the lateral side of the central member and extending only partially beneath a portion of the central member and having a surface irregularity configured to mate and interlock with the second surface irregularity of the central member, the lateral member being formed of the second or a third material having a density greater than the first density.