An article of footwear comprising: a midsole having a lower surface with a first recessed portion; an outsole coupled to the lower surface of the midsole, the outsole having an upper surface with a second recessed portion, wherein the upper surface of the outsole is engaged to the lower surface of the midsole; a first bladder element having at least one chamber filled with a fluid, the first bladder element having an upper portion contacting the lower surface of the midsole and extending at least partially into the first recessed portion; and a second bladder element having at least one chamber filled with a fluid, the second bladder element having a lower portion contacting the upper surface of the outsole and extending at least partially into the second recessed portion, wherein the first bladder element is stacked on top of the second bladder element, wherein the first bladder element has a first internal depression and the second bladder element has a second internal depression, and wherein the first recessed portion comprises a first projection that extends downward from the first recessed portion into the first internal depression and the second recessed portion comprises a second projection that extends upward from second recessed portion into the second internal depression, the article of footwear further comprising: a window extending between a lateral side and a medial side of the article of footwear, the window being collectively defined by at least a lower edge of the midsole and an upper edge of the outsole; a first exposed portion of the first bladder element that is exposed by the window and a first unexposed portion of the first bladder element that is not exposed through the window; and a second exposed portion of the second bladder element that is exposed by the window and a second unexposed portion of the second bladder element that is not exposed through the window, wherein the first and second exposed portions are spaced apart from a heel side of the window and from a forefoot side of the window, and a heel-side aperture is defined between the heel side of the window and the first and second exposed portions, and a forefoot-side aperture is defined between the forefoot side of the window and the first and second exposed portions. a midsole having a lower surface with a first recessed portion; an outsole coupled to the lower surface of the midsole, the outsole having an upper surface with a second recessed portion, wherein the upper surface of the outsole is engaged to the lower surface of the midsole; a first bladder element having at least one chamber filled with a fluid, the first bladder element having an upper portion contacting the lower surface of the midsole and extending at least partially into the first recessed portion; and a second bladder element having at least one chamber filled with a fluid, the second bladder element having a lower portion contacting the upper surface of the outsole and extending at least partially into the second recessed portion, wherein the first bladder element is stacked on top of the second bladder element, wherein the first bladder element has a first internal depression and the second bladder element has a second internal depression, and wherein the first recessed portion comprises a first projection that extends downward from the first recessed portion into the first internal depression and the second recessed portion comprises a second projection that extends upward from second recessed portion into the second internal depression, the article of footwear further comprising: a window extending between a lateral side and a medial side of the article of footwear, the window being collectively defined by at least a lower edge of the midsole and an upper edge of the outsole; a first exposed portion of the first bladder element that is exposed by the window and a first unexposed portion of the first bladder element that is not exposed through the window; and a second exposed portion of the second bladder element that is exposed by the window and a second unexposed portion of the second bladder element that is not exposed through the window, wherein the first and second exposed portions are spaced apart from a heel side of the window and from a forefoot side of the window, and a heel-side aperture is defined between the heel side of the window and the first and second exposed portions, and a forefoot-side aperture is defined between the forefoot side of the window and the first and second exposed portions. a window extending between a lateral side and a medial side of the article of footwear, the window being collectively defined by at least a lower edge of the midsole and an upper edge of the outsole; a first exposed portion of the first bladder element that is exposed by the window and a first unexposed portion of the first bladder element that is not exposed through the window; and a second exposed portion of the second bladder element that is exposed by the window and a second unexposed portion of the second bladder element that is not exposed through the window, wherein the first and second exposed portions are spaced apart from a heel side of the window and from a forefoot side of the window, and a heel-side aperture is defined between the heel side of the window and the first and second exposed portions, and a forefoot-side aperture is defined between the forefoot side of the window and the first and second exposed portions.