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A:
Yes, it's the European Standard regulations number of "EN345".
The regulations include varies code numbers which denote safety
of the footwear in different areas,
SB - protects toes from crushing
S1 - protects toes, anti static, and absorbs energy
S2 - protects toes, anti static, and absorbs energy, water proof
S3 - protects toes, anti static, and absorbs energy, water proof,
sole protection against standing on sharp objects
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