Methods of forming an article of footwear with a multipart strobel structure and articles formed by the same

A method of forming of an article of footwear, comprising:

• providing a closed transition strip that has an outer perimeter edge, an inner perimeter edge, and a width between the outer perimeter edge and the inner perimeter edge, the inner perimeter edge defining an internal opening of the closed transition strip;
• providing an inner strobel that has an outer perimeter edge;
• positioning the inner strobel in an overlapping relationship with the closed transition strip to provide an overlapping region between the outer perimeter edge of the inner strobel and the inner perimeter edge of the closed transition strip, and a non-overlapping region that extends from an outside boundary of the overlapping region to the outer perimeter edge of the closed transition strip;
• temporarily attaching the inner strobel to the closed transition strip at the overlapping region;
• positioning the closed transition strip so that both the closed transition strip and the inner strobel extend along a bottom portion of an upper from a forefoot region of the upper to a heel region of the upper;
• securing the closed transition strip to the bottom portion of the upper, the closed transition strip being attached to the upper at the non-overlapping region and with the inner strobel facing an inner portion of the upper;
• fixedly attaching the closed transition strip and bottom portion of the upper to a sole structure;
• and then
• separating the inner strobel from the closed transition strip and removing it from the inner portion of the upper.