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An article of footwear is provided and includes an outsole structure having a forefoot portion, a heel portion, and a midfoot portion disposed between the forefoot portion and the heel portion. The midfoot portion includes a series of ribs cooperating to define a series of pockets disposed between t

An article of footwear is provided and includes an outsole structure having a forefoot portion, a heel portion, and a midfoot portion disposed between the forefoot portion and the heel portion. The midfoot portion includes a series of ribs cooperating to define a series of pockets disposed between the forefoot portion and the heel portion. The plurality of pockets include a smaller volume proximate to a longitudinal axis extending through a center of the outsole structure and a greater volume proximate to an outboard, lateral edge and an outboard, medial edge of the article of footwear.

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1. An article of footwear comprising: an outsole structure including a forefoot portion, a heel portion, and a midfoot portion disposed between said forefoot portion and said heel portion, said midfoot portion including a body with a base portion, the body defining a periphery, the periphery includi

1. An article of footwear comprising: an outsole structure including a forefoot portion, a heel portion, and a midfoot portion disposed between said forefoot portion and said heel portion, said midfoot portion including a body with a base portion, the body defining a periphery, the periphery including a medial edge and a lateral edge, the body also including a first rib and a second rib that project from the base portion, the first rib and the second rib each extending longitudinally between the medial edge and the lateral edge,the first rib, the second rib, and the base portion, cooperating to define a ribless first pocket proximate to a longitudinal axis of the outsole structure,the first rib, the second rib, and the base portion, also cooperating to define a ribless peripheral pocket proximate to one of the medial and lateral edges, the first pocket having a smaller volume than the peripheral pocket. 2. The article of footwear of claim 1, wherein said midfoot portion includes a recess, wherein the body is an insert that is received within the recess. 3. The article of footwear of claim 1, wherein said first rib and said second rib are arranged in a substantially X-shape. 4. The article of footwear of claim 1, wherein said first and second ribs are spaced apart and separated from one another a greater distance adjacent the one of the medial and lateral edges, than at said longitudinal axis of said outsole structure. 5. The article of footwear of claim 1, wherein the body is formed from one of an ethylene vinyl acetate, a rubber, a thermoplastic polyurethane, and an injection pylon. 6. The article of footwear of claim 1, wherein said body is formed from a different color than at least one of said forefoot portion and said heel portion. 7. The article of footwear of claim 1, wherein said first pocket has a diamond shape. 8. The article of footwear of claim 1, wherein said first rib is substantially V-shaped, said first rib having distal ends respectively disposed proximate to said medial edge and said lateral edge, said first rib also having a first apex disposed proximate to said longitudinal axis. 9. The article of footwear of claim 8, wherein said second rib is substantially V-shaped rib, said second rib having distal ends respectively disposed proximate to said medial edge and said lateral edge, said second rib also having a second apex disposed proximate to said longitudinal axis. 10. The article of footwear of claim 9, wherein said first rib and said second rib are inverted with respect to each other. 11. A sole structure for an article of footwear, the sole structure comprising: a forefoot portion;a heel portion;a midfoot portion disposed between said forefoot portion and said heel portion, the midfoot portion including a recess; andan insert that is received within the recess, the insert including a first rib having a pair of first ends respectively disposed proximate to medial and lateral outboard edges of said insert and a second rib having a pair of second ends respectively disposed proximate to medial and lateral outboard edges of said insert, said first rib cooperating with said second rib to define a first pocket disposed proximate to a center portion of the sole structure and a pair of second pockets disposed proximate to said medial and lateral outboard edges, respectively, said first pocket including a smaller volume than each of said second pockets. 12. The sole structure of claim 11, wherein said first rib and said second rib are arranged on the insert in a substantially X-shape. 13. The sole structure of claim 11, wherein said first rib is spaced apart and separated from said second rib a greater distance at said medial outboard edge and said lateral outboard edge than at said center portion of said sole structure. 14. The sole structure of claim 11, wherein said insert is formed from one of an ethylene vinyl acetate, a rubber, a thermoplastic polyurethane, and an injection pylon. 15. The sole structure of claim 11, wherein said insert is formed from a different color than at least one of said forefoot portion and said heel portion. 16. The sole structure of claim 11, wherein said first pocket includes a substantially diamond shape. 17. The sole structure of claim 11, wherein said first rib is a substantially V-shaped rib having the pair of first ends respectively disposed proximate to said medial outboard edge and said lateral outboard edge and a first apex disposed proximate to a longitudinal axis of the sole structure. 18. The sole structure of claim 17, wherein said second rib is a substantially V-shaped rib having the pair of second ends respectively disposed proximate to said medial outboard edge and said lateral outboard edge and a second apex disposed proximate to said longitudinal axis. 19. The sole structure of claim 18, wherein said second apex of said second rib extends in an opposite direction than said first apex of said first rib. 20. The article of footwear of claim 1, wherein the periphery is defined by a medial wall and a lateral wall that project from the base portion, the medial wall defining the medial edge and the lateral wall defining the lateral edge, wherein the first rib has first distal ends respectively connected to the medial wall and the lateral wall, and wherein the second rib has second distal ends respectively connected to the medial wall and the lateral wall. 21. The article of footwear of claim 1, wherein the peripheral pocket is a medial peripheral pocket that is proximate to the medial edge, the first rib, the second rib, and the base portion also cooperating to define a lateral peripheral pocket that is proximate to the lateral edge, the first pocket having a smaller volume that both the medial and lateral peripheral pockets. 22. The article of footwear of claim 1, wherein the body also includes a third rib that projects from the base portion and that extends longitudinally between the medial edge and the lateral edge, the first rib, the third rib and the base portion cooperating to define at least one ribless third pocket that is proximate to one of the medial and lateral edges, the first pocket having a smaller volume than the at least one ribless third pocket. 23. The article of footwear of claim 22, wherein the third rib is substantially V-shaped and inverted relative to the first rib.