An intermediate sole structure of an article of footwear having an upper, the intermediate sole structure comprising: a foamed thermoplastic sole component including: a foamed thermoplastic base layer; and a foamed thermoplastic outer layer that is integrally formed with the foamed thermoplastic base layer, the outer layer including a plurality of sipes extending through the outer layer and terminating at the base layer; wherein the thermoplastic sole component has an inner surface defined by the base layer, an opposite, outer surface defined by the outer layer, and a thickness defined between the inner surface and the outer surface; wherein the inner surface is substantially planar and is operative to be adhered to a ground-facing surface of the upper, and wherein the thickness is smaller at a peripheral edge of the sole component than within a central region; wherein the sole structure is configured to be thermoformed to the upper, and some or all of the plurality of sipes splay as a result of bending that occurs in the base layer; wherein the sole structure is positioned adjacent to the ground-facing surface of the upper, and then is to be thermoformed against the upper to draw an adhesive into contact with the ground-facing surface of the upper, and such that at least a portion of the sole structure bends into contact with a sidewall of the upper; wherein the sole component has a lateral dimension that is larger than a corresponding lateral dimension of the upper intended to be coupled with the sole structure; and wherein the sole component comprises a lateral portion operative to bend into contact with a lateral sidewall of the upper and a medial portion operative to bend into contact with a medial sidewall of the upper. a foamed thermoplastic base layer; and a foamed thermoplastic outer layer that is integrally formed with the foamed thermoplastic base layer, the outer layer including a plurality of sipes extending through the outer layer and terminating at the base layer; wherein the thermoplastic sole component has an inner surface defined by the base layer, an opposite, outer surface defined by the outer layer, and a thickness defined between the inner surface and the outer surface; wherein the inner surface is substantially planar and is operative to be adhered to a ground-facing surface of the upper, and wherein the thickness is smaller at a peripheral edge of the sole component than within a central region; wherein the sole structure is configured to be thermoformed to the upper, and some or all of the plurality of sipes splay as a result of bending that occurs in the base layer; wherein the sole structure is positioned adjacent to the ground-facing surface of the upper, and then is to be thermoformed against the upper to draw an adhesive into contact with the ground-facing surface of the upper, and such that at least a portion of the sole structure bends into contact with a sidewall of the upper; wherein the sole component has a lateral dimension that is larger than a corresponding lateral dimension of the upper intended to be coupled with the sole structure; and wherein the sole component comprises a lateral portion operative to bend into contact with a lateral sidewall of the upper and a medial portion operative to bend into contact with a medial sidewall of the upper.