In order to grant efficient protection, the measures taken have to include appropriate clothing and headgear as well as suitable sun protection products. The effectiveness of sun protection products depends considerably on their consequent and generous application. Moreover, sun protection products have to be applied regularly. The protection factor indicates in which degree the sun protection product extents the skin’s own self-protection time. By using a product with factor 20, employees are allowed to expose themselves to the sun 20 times longer than without protection. However, in practice, products with a high sun protection factor also lose their effect over time. This is caused by physical exposure, rubbing and perspiration, for instance. Therefore, skin protection products have to be applied more often.