The safety shoes and boots are further divided into the following categories: 
SB: shoes and boots comply with basic requirement only. 
SBP: same as SB + steel plate midsole
S1: antistatic properties, outsole resistant to oils and fuels, energy    absorbed in heels.
SIP: same as S1 + steel plate midsole
S2: same as S1 + water penetration and absorption 
S3: same as S2 + puncture-proof and tread pattern


The standard of toe-cap:
EN 345 Safety shoes and boots with a toe-cap, chich is resistant to 200J
EN346 Protective shoes and boots with a toe-cap, which is resistant to 100J
EN 347 work shoes and boots without toe-cap