CE EN20345 standard for safety shoes for the safety shoes standard for Europe Union mainly for CE standard. the laterst ce standard for safety shoes is CE EN20345:2011. it add some function than the old standard 2007. mainly for the leather and the outsole. SAFETY CLASS(Reference EN345-1) Key Symbols Basic Function Anti-slipping,Shock-absorption heel, Oil/fuel resistant, Weak acids/alkali resistant Outsole SB - Basic safety boots with steel toe-cap "200 J" SBP – Same as SB + resistance to perforation S1 - Same as SB + Closed seat region + A + E S1P - Same as S1+ resistance to perforation S2 - Same as S1 + WRU S3 - Same as S2 + P +Cleated Outsoless Additional marking symbols P – Penetration resistant outsole tested at 1100 newtons A – Electrical resistance between foot and ground of between 0.1 and 1000 Mega Ohms * HRO – Heat