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A first and second pair of articles of footwear which may have substantially similar exterior appearances, but the internal structures are different. The first pair of articles may include a traditional sole assembly having an outsole, a midsole, and an insole. The second pair of articles of footwea

A first and second pair of articles of footwear which may have substantially similar exterior appearances, but the internal structures are different. The first pair of articles may include a traditional sole assembly having an outsole, a midsole, and an insole. The second pair of articles of footwear may include a fixed sole structure allowing for a customizable removable sole insert.

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1. A plurality of articles of footwear, comprising: a first pair of articles of footwear, wherein each article of footwear of the first pair of articles of footwear has a first upper and a first sole assembly including a first sole structure fixed in place with respect to the first upper such that t

1. A plurality of articles of footwear, comprising: a first pair of articles of footwear, wherein each article of footwear of the first pair of articles of footwear has a first upper and a first sole assembly including a first sole structure fixed in place with respect to the first upper such that the first sole structure cannot be removed from the respective article of footwear without damaging the same article of footwear and wherein the first sole assembly has a first thickness;a second pair of articles of footwear, wherein each article of footwear of the second pair of articles of footwear has a second upper and a second sole assembly, the second sole assembly including:a second sole structure fixed in place with respect to the corresponding second upper such that the second sole structure cannot be removed from the respective article of footwear of the second pair of articles of footwear without damaging the same article of footwear, wherein the second sole structure includes a grooved portion; anda first removable sole unit configured to fit within the groove portion of the second sole structure,wherein each article of footwear of the second pair of articles of footwear has a first configuration in which the first removable sole unit is placed outside of the respective article of footwear,wherein each article of footwear of the second pair of articles of footwear has a second configuration in which the first removable sole unit is placed within the respective article of footwear,wherein the second sole assembly has a second thickness when the respective article of footwear is in the first configuration;wherein the second sole assembly has a third thickness when the respective article of footwear is in the second configuration;wherein each article of footwear of the first pair of articles of footwear and each article of footwear of the second pair of articles of footwear have substantially identical footwear sizes;wherein the first thickness and the third thickness are substantially equal and wherein the third thickness is greater than the second thickness; andwherein the first upper is identical to the second upper. 2. The plurality of articles of footwear according to claim 1, wherein the first sole assembly includes a third sole structure fixed in place with respect to the first sole structure, wherein the third sole structure cannot be removed from the first pair of articles of footwear without damaging the first pair of articles of footwear. 3. The plurality of articles of footwear according to claim 2, wherein the first sole structure is a midsole layer and the third sole structure is a midsole layer. 4. The plurality of articles of footwear according to claim 3, wherein the first sole assembly further includes a first outsole fixed in place with respect to the second sole structure, wherein the first outsole cannot be removed from the first pair of articles of footwear without damaging the first pair of articles of footwear. 5. The plurality of articles of footwear according to claim 4, wherein the second sole assembly further includes a second outsole fixed in place with respect to the second sole structure, wherein the second outsole cannot be removed from the second pair of articles of footwear without damaging the second pair of articles of footwear. 6. The plurality of articles of footwear according to claim 1, wherein the first pair of articles of footwear and the second pair of articles of footwear have substantially identical lengths and wherein the first pair of articles of footwear and the second pair of articles of footwear have substantially identical widths. 7. The plurality of articles of footwear according to claim 1, wherein the second pair of articles of footwear further includes a second removable sole unit configured to fit within the groove portion of the second sole structure of one article of footwear of the second pair of articles of footwear and wherein the second removable sole unit is interchangeable with the first removable sole unit. 8. The plurality of articles of footwear according to claim 7, wherein the second removable sole unit is more supportive than the first removable sole unit. 9. A plurality of articles of footwear, comprising: a first pair of articles of footwear, wherein each article of footwear of the first pair of articles of footwear has a first upper and a first sole assembly including a first sole structure fixed in place with respect to the first upper such that the first sole structure cannot be removed from the respective article of footwear without damaging the same article of footwear and wherein each article of footwear of the first pair of articles of footwear has a first interior cavity with a first interior volume;a second pair of articles of footwear, wherein each article of footwear of the second pair of articles of footwear has a second upper and a second sole assembly, the second sole assembly including:a second sole structure fixed in place with respect to the corresponding second upper such that the second sole structure cannot be removed from the respective article of footwear of the second pair of articles of footwear without damaging the same article of footwear, wherein the second sole structure includes a grooved portion; anda removable sole unit configured to fit within the groove portion of the second sole structure,wherein each article of footwear of the second pair of articles of footwear has a first configuration in which the removable sole unit is placed outside of the respective article of footwear,wherein each article of footwear of the second pair of articles of footwear has a second configuration in which the removable sole unit is placed within the respective article of footwear,wherein each article of footwear of the second pair of articles of footwear has a second internal cavity, wherein the second internal cavity has a second interior volume when the respective article of footwear is in the first configuration and wherein the second internal cavity has a third interior volume when the same article of footwear is in the second configuration;wherein each article of footwear of the first pair of articles of footwear and each article of footwear of the second pair of articles of footwear have substantially identical footwear sizes; andwherein the first interior volume and the third interior volume are substantially equal and wherein the second interior volume is greater than the first interior volume. 10. The plurality of articles of footwear according to claim 9, wherein the first sole assembly includes a third sole structure fixed in place with respect to the first sole structure, wherein the third sole structure cannot be removed from the first pair of articles of footwear without damaging the first pair of articles of footwear. 11. The plurality of articles of footwear according to claim 10, wherein the first sole structure is a midsole layer and the third sole structure is a midsole layer. 12. The plurality of articles of footwear according to claim 9, wherein the first sole assembly further includes a first outsole fixed in place with respect to the first sole structure, wherein the first outsole cannot be removed from the first pair of articles of footwear without damaging the first pair of articles of footwear. 13. The plurality of articles of footwear according to claim 12, wherein the second sole assembly further includes a second outsole fixed in place with respect to the second sole structure, wherein the second outsole cannot be removed from the second pair of articles of footwear without damaging the second pair of articles of footwear. 14. The plurality articles of footwear according to claim 9, wherein the second pair of articles of footwear further includes a second removable sole unit configured to fit within the groove portion of the second sole structure of one article of footwear of the second pair of articles of footwear and wherein the second removable sole unit is interchangeable with the first removable sole unit. 15. The plurality of articles of footwear according to claim 14, wherein the second removable sole unit is more supportive than the first removable sole unit. 16. A plurality of articles of footwear, comprising: a first pair of articles of footwear, wherein each article of footwear of the first pair of articles of footwear has a first upper and a first sole assembly including a first sole structure fixed in place with respect to the first upper such that the first sole structure cannot be removed from the respective article of footwear without damaging the same article of footwear and wherein the first sole assembly has a first thickness;a second pair of articles of footwear, wherein each article of footwear of the second pair of articles of footwear has a second upper and a second sole assembly, the second sole assembly including:a second sole structure fixed in place with respect to the corresponding second upper such that the second sole structure cannot be removed from the respective article of footwear of the second pair of articles of footwear without damaging the same article of footwear, wherein the second sole structure includes a grooved portion; anda first removable sole unit configured to fit within the groove portion of the second sole structure,a second removable sole unit configured to fit within the groove portion of the second sole structure,wherein the first removable sole unit is interchangeable with the second removable sole unit,wherein each article of footwear of the second pair of articles of footwear has a first configuration in which the first removable sole unit is placed outside of the respective article of footwear,wherein each article of footwear of the second pair of articles of footwear has a second configuration in which the first removable sole unit is placed within the respective article of footwear,wherein the second sole assembly has a second thickness when the respective article of footwear is in the first configuration;wherein the second sole assembly has a third thickness when the respective article of footwear is in the second configuration;wherein each article of footwear of the first pair of articles of footwear and each article of footwear of the second pair of articles of footwear have substantially identical footwear sizes; andwherein the first thickness and the third thickness substantially equal and wherein the third thickness is greater than the second thickness. 17. The plurality of articles of footwear according to claim 16, wherein each article of footwear of the second pair of articles of footwear has a third configuration in which the second removable sole unit is placed within the respective article of footwear. 18. The plurality of articles of footwear according to claim 16, wherein the second sole assembly has a second thickness when the respective article of footwear is in the first configuration; wherein the second sole assembly has a third thickness when the respective article of footwear is in the second configuration;wherein each article of footwear of the first pair of articles of footwear and each article of footwear of the second pair of articles of footwear have substantially identical footwear sizes; andwherein the first thickness and the third thickness are substantially equal and wherein the third thickness is greater than the second thickness. 19. The plurality of articles of footwear according to claim 18, wherein the second sole assembly has a fourth thickness when the respective article of footwear is in the third configuration; and wherein the first thickness and the fourth thickness substantially equal and wherein the fourth thickness is greater than the second thickness. 20. The plurality of articles of footwear according to claim 19, wherein the fourth thickness is substantially equal to the third thickness.