Footwear with auxetic ground engaging members

A sole structure for an article of footwear, the sole structure comprising:

• an outer member;
• the outer member being an outermost bottom layer of the sole structure;
• a plurality of ground engaging members extending away from a base portion of the outer member, each of the ground engaging members including a plurality of hinge portions, the plurality of ground engaging members comprising at least a first ground engaging member, the first ground engaging member having a three-pointed star shape in a horizontal plane;
• the first ground engaging member comprising a first arm portion, a second arm portion, and a third arm portion, the first arm portion including a first face and a second face, wherein the first face and the second face are joined along a first hinge portion, the first hinge portion being configured to permit rotation of the first face with respect to the second face, the second arm portion including third face and a fourth face, wherein the third face and the fourth face are joined along a second hinge portion, the second hinge portion being configured to permit rotation of the third face with respect to the fourth face, the third arm portion including a fifth face and a sixth face, wherein the fifth face and the sixth face are joined along a third hinge portion, the third hinge portion being configured to permit rotation of the fifth face with respect to the sixth face;
• the first face being attached to the outer member along a fourth hinge portion, the second face being attached to the outer member along a fifth hinge portion, the third face being attached to the outer member along a sixth hinge portion, the fourth face being attached to the outer member along a seventh hinge portion, the fifth face being attached to the outer member along an eighth hinge portion, the sixth face being attached to the outer member along a ninth hinge portion;
• the first arm portion and the second arm portion being joined along a tenth hinge portion, the second arm portion and the third arm portion being joined along an eleventh hinge portion, the third arm portion and the first arm portion being joined along a twelfth hinge portion;
• a free end of the first ground engaging member being an apex, the apex defined at the intersection of the first hinge portion, the second hinge portion, and the third hinge portion;
• a plurality of apertures extending from an inner surface of the outer member, wherein each of the plurality of apertures extends into a respective one of the plurality of ground engaging members, and wherein the plurality of apertures includes a first aperture corresponding to the first ground engaging member, the first aperture defined between the first face, the second face, the third face, the fourth face, the fifth face, and the sixth face;
• and
• wherein the sole structure at least partially comprises an auxetic structure, and wherein the plurality of ground engaging members, the plurality of apertures, and the plurality of hinge portions are arranged on the outer member to provide the sole structure with the auxetic structure.