An article of footwear including a sole and an upper with an exterior and interior surface, and one or more bladders which comprises at least one of the exterior or interior surfaces of the upper. The article of footwear also includes a inflation mechanism located under the foot of the wearer to be activated by the normal action of the wearer to inflate the one or more bladders. The inflation mechanism may be monolithic with the bladder or may be a satellite inflation mechanism coupled to the bladder. The article of footwear may also include a deflation mechanism. The deflation mechanism may include a release valve capable of remaining in a open position and/or an adjustable check valve. The deflation mechanism may also be a combination check valve and release valve accessing a single opening in the bladder.