Cambered sole

1. An article of footwear having a longitudinal axis and comprising:

an upper; and

a sole comprising a midsole having a heel portion, a midfoot portion, and a forefoot portion, the midfoot portion comprising a substantially longitudinal arch comprising a medial longitudinal arch portion and a lateral longitudinal arch portion,

wherein, in an unloaded condition, the longitudinal arch is at least partially elevated above a ground surface, such that the medial longitudinal arch portion extends to a greater height above the ground surface than the lateral longitudinal arch portion, and, in a loaded condition, deforms towards the ground surface and elongates longitudinally; and

wherein a first plurality of protruding elements and at least one first tensioning element extending between discrete protruding elements of the first plurality are located within the medial longitudinal arch portion, so as to provide separate support thereto, and a second plurality of protruding elements and at least one second tensioning element extending between discrete protruding elements of the second plurality are located within the later longitudinal arch portion, so as to provide separate support thereto.

2. The article of footwear of claim 1 , wherein the forefoot portion comprises a substantially transverse arch that, in the unloaded condition, is at least partially elevated above the ground surface and, in the loaded condition, deforms towards a ground surface and elongates transversely.

3. The article of footwear of claim 2 , wherein the transverse arch is positioned proximate a metatarsal region of the forefoot portion.

4. The article of footwear of claim 2 , wherein at least one of the medial longitudinal arch portion and the lateral longitudinal arch portion extends to a greater height than the transverse arch.

5. The article of footwear of claim 1 , wherein the midsole comprises a plurality of flex grooves on a lower surface thereof.

6. The article of footwear of claim 5 , wherein at least one flex groove extends in a substantially transverse direction and at least one flex groove extends in a substantially longitudinal direction.

7. The article of footwear of claim 5 , wherein the flex grooves at least partially separate a lower surface of the midsole into the at least one first and second protruding elements located within the medial longitudinal arch portion and the lateral longitudinal arch portion, respectively.

8. The article of footwear of claim 7 , further comprising a void between the first plurality of protruding elements on the medial longitudinal arch portion and the second plurality of protruding elements on the lateral longitudinal arch portion, wherein the void is wider than the flex grooves.

9. The article of footwear of claim 1 , wherein the at least one first tensioning element on the medial longitudinal arch portion extends at an acute angle from the longitudinal axis.

10. The article of footwear of claim 1 , wherein the at least one second tensioning element on the lateral longitudinal arch portion extends in a substantially longitudinal direction.

11. The article of footwear of claim 1 , further comprising at least one tensioning element in the forefoot region.

12. The article of footwear of claim 11 , wherein the at least one tensioning element in the forefoot region extends in a substantially transverse direction.

13. The article of footwear of claim 1 , wherein the at least one tensioning element extends across at least one flex groove formed on a lower surface of the midsole.

14. The article of footwear of claim 9 , wherein the at least one first tensioning element extends at an angle between about 10 degrees and about 40 degrees from the longitudinal axis.

15. The article of footwear of claim 1 , wherein at least one of the first and the second tensioning elements comprises elastic elements.

16. The article of footwear of claim 1 , wherein at least one of the first and the second tensioning elements, in the loaded condition, provide an elastic tension counteracting a deflection of the sole and, in the unloaded condition, assist in elastically returning the longitudinal arch of the sole to its unloaded shape.

17. A sole element for an article of footwear comprising:

a midsole having a heel portion, a midfoot portion, and a forefoot portion, the midfoot portion comprising a substantially longitudinal arch comprising a medial longitudinal arch portion and a lateral longitudinal arch portion,

wherein, in an unloaded condition, the longitudinal arch is at least partially elevated above a ground surface, such that the medial longitudinal arch portion extends to a greater height above the ground surface than the lateral longitudinal arch portion, and

in a loaded condition, deforms towards the ground surface and elongates longitudinally, and

wherein a first plurality of protruding elements and at least one first tensioning element extending between discrete protruding elements of the first plurality are located within the media longitudinal arch portion, so as to provide separate support thereto, and a second plurality of protruding elements and at least one second tensioning element extending, between discrete protruding elements of the second plurality are located within the lateral longitudinal arch portion, so as to provide separate support thereto.

18. An article of footwear comprising:

an upper; and

a sole comprising:

a midsole having a heel portion, a midfoot portion, and a forefoot portion, wherein:

(i) the midfoot portion comprises a substantially longitudinal arch comprising a medial longitudinal arch portion and a lateral longitudinal arch portion, wherein, in an unloaded condition, the longitudinal arch is at least partially elevated above a ground surface, such that the medial longitudinal arch portion extends to a greater height above the ground surface than the lateral longitudinal arch portion, and, in a loaded condition, deforms towards the ground surface and elongates longitudinally; and, wherein a first plurality of protruding elements and at least one first tensioning element extending between discrete protruding elements of the first plurality are located within the medial longitudinal arch portion, so as to provide separate support thereto, and a second plurality of protruding elements and at least one second tensioning element extending between discrete protruding elements of the second plurality are located within the lateral longitudinal arch portion, so as to provide separate support thereto;

(ii) the forefoot portion comprises a substantially transverse arch that, in an unloaded condition, is at least partially elevated above the ground surface and, in a loaded condition, deforms towards the ground surface and elongates transversely; and

(iii) the midsole comprises a plurality of flex grooves on a lower surface thereof, the flex grooves at least partially separating a lower surface of the midsole into a plurality of protruding elements.

19. An article of footwear comprising:

an upper; and

a sole comprising a midsole having a heel portion, a midfoot portion, and a forefoot portion and a plurality of flex grooves on a lower surface thereof, the midfoot portion comprising a substantially longitudinal arch comprising a medial longitudinal arch portion and a lateral longitudinal arch portion, such that the longitudinal arch, in an unloaded condition, is at least partially elevated above a ground surface and, in a loaded condition, deforms towards the ground surface and elongates longitudinally,

wherein there are at least two protruding elements located within the medial longitudinal arch portion and at least two protruding elements located within the lateral longitudinal arch portion and a void is formed between at least one protruding element on the medial longitudinal arch portion and at least one protruding element on the lateral longitudinal arch portion, wherein the void is wider than the flex grooves, and

wherein at least one tensioning element located within the medial longitudinal arch portion extends between discrete protruding elements, so as to provide separate support to the medial longitudinal arch portion, and at least one tensioning element located within the lateral longitudinal arch portion extends between discrete protruding elements, so as to provide separate support to the lateral longitudinal arch portion.