The meaning of the categories for safety shoes in compliance with EN ISO 20345
 
 SB
= all basic demands are met.

S1
= all basic demands are met.
On top of this, the following additional requirements are fulfilled:
+ closed heel part also for low shoes,
+ antistatic,
+ energy assimilation at the heel part.

S2 
= all basic demands of S1 are met.
On top of this, water permeability and water vapour absorption are fulfilled.

S3 
= all basic demands of S2 are met.
On top of this, profiling of the cutsole and the application of a moulded-/steel sole.
 
 
Basically, ELTEN safety shoes are only produced according to S1-S3. On top of this, ELTEN guarantees the compliance with the demands of the former DIN EN 345-1, which was more intensively in most parts.