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A sole structure of an article of footwear includes a foam element and a non-foam element with different compressibilities. The foam element is positioned adjacent to the non-foam element. The non-foam element may define a plurality of apertures, with ends of at least a portion of the apertures bein

A sole structure of an article of footwear includes a foam element and a non-foam element with different compressibilities. The foam element is positioned adjacent to the non-foam element. The non-foam element may define a plurality of apertures, with ends of at least a portion of the apertures being located adjacent to a lower area of the foam element. The non-foam element may also form a protrusion that may be located in a central area of the non-foam element and extends into the foam element. In addition, a portion of the non-foam element that forms a side of the sole structure may define an indentation.

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1. An article of footwear having an upper and a sole structure secured to the upper, the sole structure comprising: a first midsole element formed from a first material having a first degree of compressibility, the first midsole element being positioned adjacent to the upper;a second midsole element

1. An article of footwear having an upper and a sole structure secured to the upper, the sole structure comprising: a first midsole element formed from a first material having a first degree of compressibility, the first midsole element being positioned adjacent to the upper;a second midsole element formed from a second material having a second degree of compressibility less than the first degree of compressibility, the second midsole element having an upper surface and an opposite lower surface, the upper surface being positioned adjacent to a lower area of the first midsole element, the second material contacting the lower area of the first midsole element, the second midsole element defining a plurality of apertures that extend from the upper surface to the lower surface and completely through the second midsole element, an upper portion of each of the apertures being located adjacent to the lower area of the first midsole element; andan outsole secured to at least one of the first midsole element and the second midsole element,wherein a protrusion extends upward from the upper surface of the second midsole element and extends into a depression in the lower area of the first midsole element, the protrusion being located at a portion of a heel region of the sole structure adapted to be positioned below a calcaneus bone of a wearer, and wherein at least one of the apertures extends through the protrusion. 2. The article of footwear recited in claim 1, wherein the second material contacts and is secured to a lower surface of the first midsole element. 3. The article of footwear recited in claim 1, wherein each of the apertures has an elongate configuration. 4. The article of footwear recited in claim 1, wherein each of the apertures is oriented to extend in a substantially vertical direction. 5. The article of footwear recited in claim 1, wherein the protrusion is located in a central area of the second midsole element. 6. The article of footwear recited in claim 1, wherein a sidewall portion of the second midsole element extends upward from the lower surface of the second midsole element, the sidewall portion being located adjacent to a side area of the first midsole element. 7. The article of footwear recited in claim 6, wherein the sidewall portion forms a portion of an exterior surface of the sole structure. 8. The article of footwear recited in claim 7, wherein the sidewall portion defines an elongate indentation extending into the second midsole element, the elongate indentation being located on a lateral side of the exterior surface of the sole structure. 9. The article of footwear recited in claim 1, wherein the second midsole element is located in a heel region of the article of footwear. 10. An article of footwear having an upper and a sole structure secured to the upper, the sole structure comprising: a foam element formed from a material having a first degree of compressibility, the foam element being positioned adjacent to the upper, the foam element extending from a forefoot region of the footwear to a heel region of the footwear, and the foam element extending from a lateral side of the footwear to a medial side of the footwear;a non-foam element formed from a material having a second degree of compressibility less than the first degree of compressibility, the non-foam element being located in at least the heel region and positioned adjacent to a lower area of the foam element, the non-foam element having an upper surface, an opposite lower surface, and a sidewall portion extending upward from a periphery of the lower surface, a central area of the upper surface defining a protrusion that extends into the lower area of the foam element, and the non-foam element defining a plurality of apertures extending from the upper surface to the lower surface and completely through the non-foam element, at least one of the apertures extending through the protrusion, and the sidewall portion forming at least a portion of an exterior surface of the lateral side of the footwear, the sidewall portion defining an elongate indentation extending into the non-foam element and extending along at least a portion of the lateral side of the footwear; andan outsole positioned adjacent to at least one of the lower area of the foam element and the lower surface of the non-foam element. 11. The article of footwear recited in claim 10, wherein each of the apertures has an elongate configuration. 12. The article of footwear recited in claim 10, wherein each of the apertures is oriented to extend in a substantially vertical direction. 13. The article of footwear recited in claim 10, wherein the sidewall portion forms at least a portion of the exterior surface of the lateral side of the footwear, an exterior surface of the medial side of the footwear, and an exterior surface of a rear area of the footwear. 14. An article of footwear having an upper and a sole structure secured to the upper, the sole structure consisting of: a foam element formed from a material having a first degree of compressibility, the foam element having an upper area and an opposite lower area, the upper area being positioned adjacent to the upper;a non-foam element formed from a material having a second degree of compressibility less than the first degree of compressibility, the non-foam element having an upper surface and an opposite lower surface, the upper surface defining a protrusion, the upper surface being positioned adjacent to the lower area of the foam element, and the non-foam element defining a plurality of fluid-filled apertures extending from the upper surface to the lower surface, wherein at least one of the apertures extends through the protrusion; andan outsole positioned adjacent to at least one of the lower area of the foam element and the lower surface of the non-foam element,wherein the non-foam element includes a sidewall portion that (a) forms a portion of an exterior surface of the article of footwear and (b) defines an indentation extending into the non-foam element and exhibiting an elongate shape that extends along a lateral side of the portion of the exterior surface of the article of footwear in a generally horizontal direction. 15. The article of footwear recited in claim 14, wherein at least two of the foam element, the non-foam element, and the outsole are adhesively-joined. 16. The article of footwear recited in claim 14, wherein the protrusion is located in a central area of the non-foam element. 17. The article of footwear recited in claim 14, wherein each of the apertures is oriented to extend in a substantially vertical direction. 18. The article of footwear recited in claim 14, wherein air is located within the apertures.