Article of apparel including auxetic layer coupled to elastic layer

1. An article of apparel comprising:

a base layer comprising a four way stretch material; and

an auxetic layer coupled to the base layer, the auxetic layer comprising an auxetic structure defining a repeating pattern of voids, wherein the base layer is exposed by at least one void of the auxetic layer.

2. The article of apparel of claim 1 wherein at least one void of the repeating pattern of voids defines a reentrant shape.

3. The article of apparel of claim 1 wherein at least one void of the repeating pattern of voids in the auxetic structure is at least partially filled with a foam.

4. The article of apparel of claim 1 wherein at least one void of the repeating pattern of voids in the auxetic structure is at least partially filled with a hot melt material.

5. The article of apparel of claim 1 wherein the four way stretch material is a compression fabric and an entirety of the auxetic layer is directly connected to the compression fabric such that the auxetic layer and the compression fabric form a unitary sheet.

6. The article of apparel of claim 1 wherein the auxetic structure is comprised of a polymer material.

7. The article of apparel of claim 6 wherein the polymer material is a foam material.

8. The article of apparel of claim 1 further comprising a foam layer between the base layer and the auxetic layer, the foam layer having a same shape as the auxetic layer.

9. The article of apparel of claim 1 wherein the base layer is positioned on a first side of the auxetic layer, the article of apparel further comprising a cover layer positioned on a second side of the auxetic layer.

10. The article of apparel of claim 9 wherein the base layer is connected to the cover layer in a plurality of the voids.

11. The article of apparel of claim 1 wherein each void has a bow-tie shape.

12. The article of apparel of claim 1 wherein the auxetic structure comprises a plurality of interconnected members.

13. The article of apparel of claim 12 wherein the interconnected members are between 1 mm and 5 mm wide.

14. An article of apparel comprising:

an elastic material; and

a near auxetic structure coupled to the elastic material, the near auxetic structure including a plurality of interconnected members forming an array of voids, wherein the elastic material is exposed by at least one void of the near auxetic structure.

15. The article of apparel of claim 14 wherein at least one void of the array of voids defines a reentrant shape, and wherein the first elastic layer and the second elastic layer are directly coupled to the near auxetic structure across an entirety of the near auxetic structure such that the first elastic layer, the near auxetic structure, and the second elastic layer form a unitary sheet.

16. The article of apparel of claim 14 wherein at least one void of the array of voids is at least partially filled with a polymer material.

17. The article of apparel of claim 14 wherein the elastic material provides a first elastic layer positioned on a first side of the near auxetic layer, the article of apparel further comprising a second elastic layer positioned on a second side of the near auxetic layer.

18. An article of apparel comprising:

a first layer comprising an elastic sheet; and

a second layer directly coupled to the first layer such that the first layer and the second layer form a unitary sheet, the second layer comprising a structure including a plurality of interconnected members defining a uniform array of substantially planar shapes with voids formed between the interconnected members in the second layer, each of the interconnected members directly coupled to the first layer, the structure having a Poisson's ratio of substantially zero or less than zero.

19. The article of apparel of claim 18 wherein at least one of the voids formed between the interconnected members defines a reentrant shape.

20. The article of apparel of claim 18 wherein at least one of the voids formed between the interconnected members is at least partially filled with a polymer material.