SB
This category indicates that the footwear meets with the basic criteria of resistance and protection of the toe area. The S stands for safety footwear, and is followed by a letter or a number which determines its type. B stands for Basic.
S1
The S1 footwear presents novel features such as closed back, antistatic (A), hydrocarbon resistant (FO) and energy absorbing in the heel area (E), as well as meeting basic requirements (SB).
S2
The S2 category indicates that the footwear meets the standards of the S1 category, (and therefore the SB category), in addition to providing resistance to water and liquid absorption in the upper part of the footwear.
S3
Continuing with the previous one, this footwear meets the standards of category S2 (and therefore also of categories SB and S1), in addition to providing a lugged sole and a resistance to sole puncture.
S6
This category refers to S2 category with water resistance in all of the shoe or boot, not only upper.
S7
All of the S3 standards, with each specific sole puncture category and with water resistance in every part of the shoe or boot.