Protective hats and head coverings protect workers from hazards like impact, debris, chemical splash, UV light and arc flash. Head coverings, such as bandanas and sweatbands, absorb perspiration. Hairnets and beard covers prevent contamination in cleanrooms and medical facilities. Face shields protect workers from flying debris and liquid splashes. Bump hats and hard hats are used in environments where vertical and lateral impact are hazards to workers. Bump hats protect against moderate impact, while hard hats protect against penetration, vertical impact and lateral impact.