A sole structure (12; 412) for an article of footwear, the sole structure (12; 412) comprising: an outsole (14; 414) having: a body (17; 417) with a lateral side (22; 422) and a medial side (24; 424); a plurality of tread elements (18; 418) extending from the body (17; 417) to establish a ground contact surface; wherein at least two of the tread elements (18; 418) extend between the lateral side (22; 422) and the medial side (24; 424) and each include a front face (52; 452), a rear face (54; 454), and a bottom face (20; 420) that connects the front face (52; 452) and the rear face (54; 454); and wherein the bottom face (20; 420) of each of the at least two of the tread elements (18; 418) has a width between the front face (52; 452) and the rear face (54; 454) that varies between the lateral side (22; 422) and the medial side (24; 424) forming different shapes of the tread elements (18; 418) wherein the outsole has a heel region and a forefoot region; and wherein the body of the outsole is divided into a first body portion at the forefoot region and a second body portion at the heel region; and wherein the first body portion is discontinuous from the second body portion, and further comprising: a midsole assembly; wherein the outsole is attached to a lower surface of the midsole assembly; and wherein a portion of the lower surface of the midsole assembly is exposed between the first body portion and the second body portion of the outsole, and wherein the midsole assembly has a first layer defining the lower surface; wherein the first layer has slots exposed between the first body portion and the second body portion; and wherein the midsole assembly has ribs extending through the slots; and wherein the ribs are stiffer than the first layer. an outsole (14; 414) having: a body (17; 417) with a lateral side (22; 422) and a medial side (24; 424); a plurality of tread elements (18; 418) extending from the body (17; 417) to establish a ground contact surface; wherein at least two of the tread elements (18; 418) extend between the lateral side (22; 422) and the medial side (24; 424) and each include a front face (52; 452), a rear face (54; 454), and a bottom face (20; 420) that connects the front face (52; 452) and the rear face (54; 454); and wherein the bottom face (20; 420) of each of the at least two of the tread elements (18; 418) has a width between the front face (52; 452) and the rear face (54; 454) that varies between the lateral side (22; 422) and the medial side (24; 424) forming different shapes of the tread elements (18; 418) a body (17; 417) with a lateral side (22; 422) and a medial side (24; 424); a plurality of tread elements (18; 418) extending from the body (17; 417) to establish a ground contact surface; wherein at least two of the tread elements (18; 418) extend between the lateral side (22; 422) and the medial side (24; 424) and each include a front face (52; 452), a rear face (54; 454), and a bottom face (20; 420) that connects the front face (52; 452) and the rear face (54; 454); and wherein the bottom face (20; 420) of each of the at least two of the tread elements (18; 418) has a width between the front face (52; 452) and the rear face (54; 454) that varies between the lateral side (22; 422) and the medial side (24; 424) forming different shapes of the tread elements (18; 418) wherein the outsole has a heel region and a forefoot region; and wherein the body of the outsole is divided into a first body portion at the forefoot region and a second body portion at the heel region; and wherein the first body portion is discontinuous from the second body portion, and further comprising: a midsole assembly; wherein the outsole is attached to a lower surface of the midsole assembly; and wherein a portion of the lower surface of the midsole assembly is exposed between the first body portion and the second body portion of the outsole, and wherein the midsole assembly has a first layer defining the lower surface; wherein the first layer has slots exposed between the first body portion and the second body portion; and wherein the midsole assembly has ribs extending through the slots; and wherein the ribs are stiffer than the first layer. a midsole assembly; wherein the outsole is attached to a lower surface of the midsole assembly; and wherein a portion of the lower surface of the midsole assembly is exposed between the first body portion and the second body portion of the outsole, and wherein the midsole assembly has a first layer defining the lower surface; wherein the first layer has slots exposed between the first body portion and the second body portion; and wherein the midsole assembly has ribs extending through the slots; and wherein the ribs are stiffer than the first layer.