Patent ID: 8813389

Claim:
A bladder system for an article of footwear, comprising: a sole structure including an outer bladder bounding an interior cavity; wherein the sole structure has a forefoot portion, a heel portion, and a midfoot portion in between the forefoot portion and the heel portion; at least one tensile member disposed inside the interior cavity; a valve member disposed inside the interior cavity, the valve member providing fluid communication between the interior cavity and an exterior of the outer bladder; wherein the valve member is disposed in the midfoot portion of the sole structure and includes: a first surface that is forwardly oriented toward the forefoot portion and that is at a decline toward the forefoot portion, a second surface rearwardly oriented toward the heel portion and facing a sidewall of the at least one tensile member, a third surface that is generally perpendicular to the first surface and the second surface and is on a medial side of the valve member, a fourth surface that is opposite to the third surface, is generally perpendicular to the first surface and the second surface, and is on a lateral side of the valve member, and a fifth surface that is a lower surface that faces in a ground surface direction; and wherein the internal pressure of the outer bladder can be adjusted.