Tyvek® APX® offers very high breathability combined with equivalent durability and protection against hazardous substances. This newly developed protective clothing material, based on the long-established Tyvek® protective clothing material, offers high comfort even under extreme temperature and humidity conditions. This was confirmed in extensive tests conducted in collaboration with the Swiss Federal Laboratories for Materials Science and Technology (Empa) and the U.S.-based Epicore Biosystems Laboratory.