In footwear having a permeable top side, an insole and heel associated with its outer sole, an improved circulation system includes a plurality of perforated air channels tanned in the insole, a compressible pump means having an inlet and an outlet located in a cavity in the footwear's heel, a reciprocal ball piston located below the pump means in the heel so the piston extends beyond the base of the heel when heel is not in contact with a walking surface and is operable to actuate the pump when the heel of the footwear engages a walking surface daring the wearer's ambulatory movement, an air passage connecting the inlet of the pump to the plurality of air channels, a second air passage connecting the outlet of the pump with the atmosphere, and one way check valves in each air passage allowing air to flow in only one direction in its associated air passage whereby the cycling of the piston will circulate air though the footwear.