An insole for ventilating shoes or boots comprising an air intake passage, an inflatable elastic bladder, an air exhaust passage, a ventilating capillary, and valve means. The bladder is formed along the peripheral area of the heel portion of the insole. Periodic application and release of pressure to...http://www.google.fr/patents/US5333397?utm_source=gb-gplus-shareBrevet US5333397 - Inflatable ventilating insole
