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A method of forming a midsole includes the steps of placing a first mold member and a second mold member in contact with one another, injecting a first material into the first mold member to form first and second portions of a midsole preform, positioning the first and second portions in a third mol

A method of forming a midsole includes the steps of placing a first mold member and a second mold member in contact with one another, injecting a first material into the first mold member to form first and second portions of a midsole preform, positioning the first and second portions in a third mold member of a second mold assembly; placing a second material in the third mold member; placing the third mold member and a fourth mold member in contact with one another, subjecting the second material and the first and second portions to heat to form a midsole preform, placing the midsole preform in a fifth mold member, placing the fifth mold member and a sixth mold member in contact with one another; and subjecting the midsole preform to heat and pressure to form a midsole.

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1. A method of forming a midsole comprising the steps of: placing a first mold member and a second mold member of a first mold assembly in contact with one another;injecting a first material into a first recess and a second recess in the first mold member to form first and second portions of a midso

1. A method of forming a midsole comprising the steps of: placing a first mold member and a second mold member of a first mold assembly in contact with one another;injecting a first material into a first recess and a second recess in the first mold member to form first and second portions of a midsole preform while the first mold member is maintained at a temperature below an ambient temperature;positioning the first and second portions in a first midsole recess in a third mold member of a second mold assembly;placing a second material in the first midsole recess;placing the third mold member and a fourth mold member of the second mold assembly in contact with one another;subjecting the second material and the first and second portions in the second mold assembly to heat to form a midsole preform;placing the midsole preform in a second midsole recess in a fifth mold member of a third mold assembly;placing the fifth mold member and a sixth mold member of the third mold assembly in contact with one another; andsubjecting the midsole preform in the third mold assembly to heat and pressure to form a midsole. 2. The method of forming a midsole of claim 1, wherein the first mold member includes at least one additional first recess and at least one additional second recess, an additional first portion of a midsole preform being formed in each additional first recess, and an additional second portion of a midsole preform being formed in each additional second recess. 3. The method of forming a midsole of claim 1, wherein the first and second portions are positioned in a forefoot portion of the midsole preform, the second portion being positioned rearwardly of first portion. 4. The method of forming a midsole of claim 1, wherein the first material has a first hardness and the second material has a second hardness that is different than the first hardness. 5. The method of forming a midsole of claim 1, wherein the second material is placed in the second recess in the form of pellets. 6. The method of forming a midsole of claim 1, wherein the first mold member of the first mold assembly includes a channel, the channel extending between the first and second recesses and an exterior of the first mold member. 7. The method of forming a midsole of claim 6, wherein the first material is injected into the first recess through the channel. 8. The method of forming a midsole of claim 1, wherein the first material is EVA. 9. The method of forming a midsole of claim 1, wherein the second material is EVA. 10. The method of forming a midsole of claim 1, wherein the midsole preform is approximately 160-170% of a size of the midsole. 11. The method of forming a midsole of claim 1, wherein a first groove is formed about a periphery of the first portion of the midsole preform and a second groove is formed about a periphery of the second portion of the midsole preform. 12. The method of forming a midsole of claim 11, wherein the first groove is formed by a first wall extending upwardly from a bottom of the first mold recess of the second mold assembly, and the second groove is formed by a second wall extending upwardly from a bottom of the first mold recess of the second mold assembly. 13. The method of forming a midsole of claim 1, wherein a third portion is formed in a heel portion of the midsole preform, a third groove being formed about a periphery of the third portion. 14. The method of forming a midsole of claim 13, wherein the third groove is formed by a third wall extending upwardly from a bottom of the first mold recess of the second mold assembly. 15. A method of forming a sole assembly comprising the steps of: placing a first mold member and a second mold member of a first mold assembly in contact with one another;injecting a first material into a first recess and a second recess in the first mold member to form a first portion and a second portion of a midsole preform while the first mold member is maintained at a temperature below an ambient temperature;positioning the first portion and the second portion in a first midsole recess in a third mold member of a second mold assembly;placing a second material having a hardness different than a hardness of the first material in the first midsole recess;placing the third mold member and a fourth mold member of the second mold assembly in contact with one another;subjecting the second material and the first and second portions in the second mold assembly to heat to form a midsole preform;placing the midsole preform in a second midsole recess in a fifth mold member of a third mold assembly;placing the fifth mold member and a sixth mold member of the third mold assembly in contact with one another;subjecting the midsole preform in the third mold assembly to heat and pressure to form a midsole;removing the midsole from the third mold assembly; andsecuring an outsole to the midsole. 16. The method of forming a midsole of claim 15, wherein a first groove is formed about a periphery of the first portion of the midsole preform and a second groove is formed about a periphery of the second portion of the midsole preform. 17. The method of forming a midsole of claim 16, wherein the first groove is formed by a first wall extending upwardly from a bottom of the first mold recess of the second mold assembly, and the second groove is formed by a second wall extending upwardly from a bottom of the first mold recess of the second mold assembly. 18. The method of forming a midsole of claim 15, wherein a third portion is formed in a heel portion of the midsole preform, a third groove being formed about a periphery of the third portion. 19. The method of forming a midsole of claim 18, wherein the third groove is formed by a third wall extending upwardly from a bottom of the first mold recess of the second mold assembly. 20. A method of forming a sole assembly comprising the steps of: placing a first mold member and a second mold member of a first mold assembly in contact with one another;injecting a first material into a first recess and a second recess in the first mold member to form a first portion and a second portion of a midsole preform while the first mold member is maintained at a temperature below an ambient temperature;removing the first and second portions from the first recess and the second recess, respectively;positioning the first portion and the second portion in a first midsole recess in a third mold member of a second mold assembly;placing a second material in the first midsole recess in the third mold member;placing the third mold member and a fourth mold member of the second mold assembly in contact with one another;subjecting the second material and the first and second portions in the second mold assembly to heat to form a midsole preform, the midsole preform having a first groove formed about a periphery of the first portion, a second groove formed about a periphery of the second portion, and a third groove formed about a periphery of a third portion formed in the midsole preform;placing the midsole preform in a second midsole recess in a fifth mold member of a third mold assembly;placing the fifth mold member and a sixth mold member of the third mold assembly in contact with one another;subjecting the midsole preform in the third mold assembly to heat and pressure to form a midsole;removing the midsole from the third mold assembly; andsecuring an outsole to the midsole.