Abstract: An upper for an article of footwear may include a first tubular knit structure, where the first tubular knit structure includes a first layer and a second layer, the first layer and the second layer being separable such that a first passage is located between the first layer and the second layer. A second tubular knit structure may be included, where the second tubular knit structure includes a third layer and a fourth layer, the third layer and the fourth layer being separable such that a second passage is located between the third layer and the fourth layer. A longitudinal direction of the first tubular knit structure may be angled at least 5 degrees relative to a longitudinal direction of the second tubular knit structure.