Knitted upper with two sides and an underfoot portion

1. A knitted component for an article of footwear, the knitted component comprising:

a first side and a second side, the first side and the second side forming an overfoot portion; and

an underfoot portion positioned between the first side and the second side, the underfoot portion being coextensive with a sole structure of the article of footwear,

wherein at least a portion of the first side is located on a medial or a lateral side of the article of footwear and wherein at least a portion of the second side is located on the other of the medial and the lateral side of the article of footwear,

wherein a course of the knitted component extends from the first side, through the underfoot portion, and to the second side,

wherein the first side includes a toe portion, the toe portion having an underfoot side, an overfoot side, and a cavity therebetween, and

wherein the underfoot side of the toe portion includes a first edge extending from a lateral edge of the sole structure to a medial edge of the sole structure, wherein the underfoot portion includes a second edge extending from the lateral edge of the sole structure to the medial edge of the sole structure,

wherein a seam connects the first edge and the second edge, and

wherein the seam extends along the first edge and the second edge from the lateral edge of the sole structure of the medial edge of the sole structure.

2. The knitted component of claim 1 , wherein the course is formed by a single pass of a knitting machine.

3. The knitted component of claim 1 , wherein the cavity forms at least a portion of a void for receiving a foot.

4. The knitted component of claim 1 , wherein the toe portion includes a connection structure formed on a knitting machine and joining the underfoot side and the overfoot side.

5. The knitted component of claim 1 , wherein the underfoot side of the toe portion is inverted with respect to the underfoot portion.

6. The knitted component of claim 1 , further comprising a cup-shaped heel portion with a knitted edge configured to form a collar of the article of footwear.

7. The knitted component of claim 1 , further comprising a fastening element coupled to the first side and the second side and configured to pull the first side with respect to the second side to tighten the knitted component around a foot.

8. A knitted component for an article of footwear, the knitted component comprising:

a first side and a second side, the first side and the second side forming an overfoot portion of the article of footwear; and

an underfoot portion positioned between the first side and the second side such that a common course extends through the first side, the second side, and the underfoot portion, the underfoot portion being coextensive with a sole structure of the article of footwear; and

a toe portion, the toe portion having an underfoot side, an overfoot side, and a cavity therebetween,

wherein the overfoot side of the toe portion includes a course that is interlooped with at least one course of the first side of the knitted component,

wherein the underfoot side of the toe portion includes an edge that is secured to the underfoot portion via a seam, and

wherein an entire length of the seam is covered by the sole structure.

9. The knitted component of claim 8 , wherein the toe portion is inverted with respect to the underfoot portion such that the underfoot side of the toe portion is inverted relative to the underfoot portion.

10. The knitted component of claim 9 , wherein the underfoot side of the toe portion faces the same direction as the underfoot portion of the knitted component.

11. The knitted component of claim 8 ,

wherein the cavity forms at least a portion of a void for receiving a foot, and

wherein the toe portion includes a connection structure formed on a knitting machine and joining the underfoot side and the overfoot side.

12. An article of footwear, comprising:

a knitted component having an underfoot portion,

a first side of the knitted component extending from the underfoot portion such that the first side and the underfoot portion include a common course;

a second side of the knitted component extending from the underfoot portion such that the second side and the underfoot portion include a common course; and

a toe portion of the knitted component having overfoot side and an underfoot side, wherein a cavity is located between the overfoot side and the underfoot side,

wherein the overfoot side of the toe portion is secured to the first side of the knitted component via knitted loops, and

wherein the underfoot side of the toe portion is secured to the underfoot portion via a seam that extends along the underfoot side from a medial side of the underfoot portion to a lateral side of the underfoot portion.

13. The article of footwear of claim 12 , wherein the seam extends along the underfoot side from a lateral edge of a sole structure to a medial edge of the sole structure.

14. The article of footwear of claim 12 , wherein an entire length of the seam is covered by a sole structure.