A shoe insert includes: a housing insertable in a shoe interior and having perforations formed through the housing for directing moisture-laden air from the shoe interior into the housing, a gas-permeable filter cloth lined on an inside surface of the housing and containing activated carbon in the filter...http://www.google.es/patents/US6675421?utm_source=gb-gplus-sharePatente US6675421 - Regeneratively dehumidifying and deodorizing shoe insert
Regeneratively dehumidifying and deodorizing shoe insert
