The A 640 is an enclosed steel-toe cap PU clog offering reliable grip. maximum sure-footedness and protects toes and the front of the foot from impacts of up to 200 joules. The upper material is oil. grease and water-resistant. allowing it to be cleaned efficiently and thoroughly at up to 80?? Celsius. The anatomically shaped footbed protects joints and tendons and can be removed and washed at up to 30?? Celsius. The A 640 model is certified in accordance with EN ISO 20345:2011 SB E (SRC category).