birkenstock dichte klomp alpro a640 beveiligd blauw 0020252 1518 boa ensuring optimal safety in environments Size workwear:60 ensuring optimal safety in environments where electrostatic discharge and chemical exposure are concerns Infinergy® by BASF midsole for energy return and reduced fatigue Its slip resistant sole offers excellent grip Safety Class SB E (SRC): Steel toe cap for impact protection up to 200 joules