An article of footwear has a shoe upper, a sole connected to the shoe upper and the sole is provided with peripheral walls which together define a cavity therein. A layer of material extends across and is connected to the walls or adjacent to the walls at a perimeter of the layer of material, the layer of material dividing the cavity into at least a first chamber and a second chamber. The layer of material and the walls on one side of the perimeter of the layer of material define the first chamber, and the layer of material and the walls on the other side of the perimeter of the layer of material define the second chamber. The sole is configured such that movement of the layer of material within the cavity causes simultaneous changing of interior volume between the chambers and thus pumping of air into or out of the chambers for air circulation of the article of footwear.