Lab coats, gowns, or fluid-proof aprons, should be worn in laboratory settings. Long sleeved garments are preferred to minimize contamination of skin or street clothes and to reduce shedding of microorganisms from the arms. Back-opening gowns offer better protection than lab coats and are required when working in a BSL3 laboratory. Aprons should be worn over lab coats to provide additional protection from spills and chemicals. If clothing must be autoclaved, it must be capable of withstanding high temperatures. Additional criteria for selecting clothing are: comfort, appearance, closures, anti-static properties and durability. Consideration must be given to having disposable clothing available for visitors, maintenance and service workers.