Article of footwear incorporating a knitted component with a tongue

1. An article of footwear having an upper and a sole structure secured to the upper, the upper comprising:

a knit element defining a portion of at least one of an exterior surface of the upper and an opposite interior surface of the upper, the interior surface defining a void for receiving a foot; and

a tongue formed of unitary knit construction with the knit element such that the tongue and the knit element comprise a one piece element, and wherein the tongue extends through a throat area of the upper;

wherein the tongue comprises a lateral edge and a medial edge, the lateral edge and the medial edge of the tongue being unsecured to the knit element along a medial side and a lateral side of the throat area of the upper; and

wherein the tongue is secured to the knit element in a forward portion of the throat area such that the tongue is joined along at least one common course with the knit element to form the one-piece element.

2. The article of footwear recited in claim 1 , wherein the tongue extends to an ankle opening of the upper.

3. The article of footwear recited in claim 1 , wherein at least a portion of the knit element and at least a portion of the tongue are formed from a common yarn.

4. The article of footwear recited in claim 1 , wherein at least a portion of the knit element and at least a portion of the tongue are formed from a common knit structure.

5. The article of footwear recited in claim 1 ,

wherein the tongue comprises a first knitted layer and a second knitted layer; and

wherein at least a portion of the tongue includes the first knitted layer, the second knitted layer, and a plurality of free yarn sections, the first knitted layer and the second knitted layer being adjacent to each other and formed of unitary knit construction along each of the medial edge and the lateral edge of the tongue, and the free yarn sections being located between the first knitted layer and the second knitted layer.

6. The article of footwear recited in claim 1 , wherein at least a portion of the tongue includes a plurality of knit apertures.

7. The article of footwear recited in claim 1 , wherein the knit element extends from the throat area to a lower area of the upper, and an inlaid strand extends through the knit element from the throat area to the lower area.

8. The article of footwear recited in claim 7 , wherein the inlaid strand extends at least partially around apertures in the throat area.

9. The article of footwear recited in claim 8 , wherein the inlaid strand is located between the exterior surface and the interior surface in the throat area.

10. The article of footwear recited in claim 7 , wherein the inlaid strand repeatedly extends from the throat area to the lower area.

11. The article of footwear recited in claim 1 , wherein the knit element and the tongue include at least one course in common only along the forward portion of the throat area.

12. The article of footwear recited in claim 1 , wherein at least one course associated with the knit element is joined with at least one course associated with the tongue only along the forward portion of the throat area; and

wherein a plurality of courses associated with the tongue are joined only to each other along each of the medial edge and the lateral edge of the tongue.

13. The article of footwear recited in claim 1 , wherein the knit element includes at least one course that is substantially continuous with at least one course of the tongue at the forward portion of the throat area of the upper; and

wherein courses associated with the knit element and courses associated with the tongue remain unsecured along the medial side and the lateral side of the throat area of the upper.