For people who want to keep their feet more clean and dry,this model offers protection against spills and keeps feet warmer in colder weather. Extra heel protection was added to this model to meet Occupational Health and Safety guidelines in hospitals, food preparation areas and other institutional settings. Air, sand and water move easily through the clog for water sports, camping and other active applications. They also dry very quickly. Our products are resistant to ultraviolet light, industrial chemicals and rough objects.