Patent ID: 7918041

Claim:
An article of footwear, comprising: an upper; an upper sole portion including an upper sole portion body and a projecting portion extending from a first side of the upper sole portion body; the upper sole portion including at least one aperture; a lower sole portion including a first side configured to contact the upper sole portion body and a second side configured to contact a ground surface; the lower sole portion including a hole, the hole configured to extend through the lower sole portion from the first side to the second side and is further configured to receive the projecting portion of the upper sole portion; a compression chamber defined by a lower surface of the projecting portion and at least one wall of the hole extending through the lower sole portion; the compression chamber having a first volume; wherein the compression chamber has a second volume after being compressed and wherein the change in volume forces air through the at least one aperture; wherein the lower sole portion includes at least one channel; and wherein the channel corresponds to the aperture.