S1 vs S2 vs S3 Safety Shoes: What Is the Difference?

S1, S2 and S3 are safety shoe categories under EN ISO 20345, but they are not simple quality grades. S1 is commonly used as a starting point for mainly dry indoor work. S2 adds resistance to water penetration and absorption in the upper. The S3 family adds sole penetration resistance and a cleated outsole to the S2 package.

These codes do not, by themselves, prove that footwear is electrically insulating, chemically resistant or completely waterproof. Under the current EN ISO 20345:2022 framework, suffixes such as P, PL and PS also matter. The full label and evidence for the exact model should therefore be checked before footwear is selected for a workplace hazard.

What Do S1, S2 and S3 Mean in Safety Footwear?

EN ISO 20345 covers safety footwear for general occupational use. Its defining basic protection is a safety toe cap tested as part of the complete footwear. Additional features are grouped into categories such as S1, S2 and S3, or shown through separate markings for properties such as slip resistance, heat resistance, cold insulation or whole-footwear water resistance.

The current international document is ISO 20345:2021 with Amendment 1:2024. In Europe, the corresponding reference is EN ISO 20345:2022 with A1:2024. The year matters because the 2022 framework changed several markings, especially those for sole penetration and slip resistance. A shoe marked under an older edition should be explained according to that edition rather than silently relabelled with current codes.

The comparison below shows the practical difference between the main categories. It is a selection aid, not a replacement for the full standard or a workplace risk assessment.

Feature	S1	S2	S3 / S3L / S3S
EN ISO 20345 safety toe protection	Yes	Yes	Yes
Closed seat region	Yes	Yes	Yes
Antistatic properties	Yes	Yes	Yes
Energy absorption in the seat region	Yes	Yes	Yes
Upper resistance to water penetration and absorption	No category requirement	Yes	Yes
Sole penetration resistance	No	No	Yes: P, PL or PS route
Cleated outsole	No category requirement	No category requirement	Yes
Whole-footwear water resistance (WR)	Not established by S1	Not established by S2	Check S6/S7 family or exact marking
Electrical insulation	No	No	No
Typical starting point	Mainly dry indoor work	Damp work without underfoot penetration risk	Moisture plus underfoot penetration hazards

Practical summary only. Optional properties such as FO, SR, HRO, HI, CI, WR or M must be checked separately where required.

What Does S1 Mean in Safety Shoes?

S1 is a category for Class I safety footwear made from leather or other materials rather than all-rubber or all-polymeric construction. In addition to the basic safety-footwear requirements, the S1 package includes a closed seat region, antistatic properties and energy absorption in the seat region.

S1 safety footwear is often considered for dry indoor environments such as warehouses, assembly areas, logistics operations and light manufacturing. It can be a sensible starting point when there is no identified need for protection against water entering the upper and no risk from sharp objects penetrating through the sole.

The S1 code does not tell you whether the toe cap is steel, aluminium or non-metallic. It also does not establish sole penetration resistance, whole-footwear water resistance, chemical protection or electrical insulation. Those properties must be checked separately.

What Does S2 Add to S1 Safety Footwear?

S2 includes the S1 protection package and adds resistance to water penetration and absorption in the upper. This makes it relevant where the footwear may encounter damp conditions, cleaning splashes or brief contact with water, but the risk assessment does not require a penetration-resistant insert under the foot.

S2 is commonly associated with work such as food handling, cleaning, facility services and some light outdoor duties. The actual suitability still depends on the floor, the amount and duration of moisture exposure, hygiene requirements and any additional hazards.

Important: S2 should not be described as fully waterproof. Resistance to water penetration and absorption in the upper is not the same as whole-footwear water resistance. Water may still enter through the opening or other parts of the construction.

What Does S3 Mean in Safety Shoes?

The S3 family combines the S2 package with sole penetration resistance and a cleated outsole. It is commonly considered for construction, maintenance, utilities and mixed indoor-outdoor work where the upper may meet moisture and sharp objects such as nails, wire or metal fragments may be present underfoot.

Under EN ISO 20345:2022, the suffix identifies the sole-penetration route. S3, S3L and S3S are related categories, but they are not labels to use interchangeably. The complete marking and supporting documentation should show which construction and test route apply to the exact model.

S3 does not automatically establish chemical resistance, metatarsal protection, contact-heat resistance, cold insulation, electrical insulation or complete waterproofing. Those hazards require the relevant optional marking, specialist standard or exact-model evidence.

What Is the Difference Between S1 and S3 Safety Shoes?

The main difference is that the S3 family includes two features that S1 does not: resistance to water penetration and absorption in the upper, and sole penetration resistance with a cleated outsole.

S1 can be appropriate for a dry warehouse or assembly line where the floor is controlled and sharp debris is not expected. The S3 family is a more suitable starting point where workers move between indoor and outdoor areas, moisture reaches the upper, and nails or other sharp objects may be present underfoot.

That does not make S3 universally better. A heavier or more structured shoe may be unnecessary in a clean indoor setting, while an S3 code alone may still be insufficient for a chemical, electrical, welding or extreme-temperature hazard. Match the verified properties to the work rather than selecting the largest category number.

What Is the Difference Between S2 and S3 Safety Shoes?

S2 and the S3 family share the upper water penetration and absorption requirement. The S3 family then adds sole penetration resistance and a cleated outsole. That is the central technical difference.

Choose between them by asking whether sharp objects could penetrate the sole and whether a cleated outsole is appropriate for the terrain. S2 may suit a damp, controlled workplace without an underfoot penetration hazard. S3, S3L or S3S may be the better starting point for rougher ground or work sites with nails and debris.

The category does not determine footwear weight, boot height, toe-cap material or comfort. Those are model-specific design choices. It also does not prove protection against every slippery surface, chemical or electrical risk.

What Is the Difference Between S1P and S3 Safety Shoes?

Both S1P and the S3 family include sole penetration resistance, so the key difference is not the presence of a protective toe cap or an insert alone. S1P builds on the S1 package and is commonly considered where the workplace is mainly dry but sharp objects may be present underfoot.

The S3 family also includes upper resistance to water penetration and absorption and a cleated outsole. It is therefore more closely associated with damp, changing or outdoor conditions. If whole-footwear water resistance is required, however, neither the words “S1P” nor “S3” are enough; the WR marking and the relevant current category must be checked.

Do not assume that every S1P shoe uses a steel midsole or every S3 shoe uses a steel toe. Toe-cap material and penetration-resistant insert construction are separate design questions.

What Do S1P, S1PL, S1PS, S3L and S3S Mean?

The 2022 standard framework makes the type and test route for sole penetration resistance more visible in the category code. The main distinction is:

• P is associated with a metallic penetration-resistant insert and the applicable P test route.
• PL is associated with a non-metallic insert tested through the PL route.
• PS is associated with a non-metallic insert tested through the PS route, which uses a different test condition and smaller test nail than PL.

S1P, S1PL and S1PS all build on S1. S3, S3L and S3S all build on S2 and also require a cleated outsole. The suffix is not a marketing grade, and PS should not automatically be called the best option for every job. Insert material, coverage, flexibility, footwear construction and the actual objects present on the floor all affect the decision.

Older certificates and labels may use the earlier S1P or S3 terminology without the newer L or S suffix. Always read the code together with the stated edition of the standard.

Are S2 and S3 Safety Shoes Waterproof?

Not necessarily. S2 and the S3 family address water penetration and absorption in the upper, but that does not mean the complete footwear will keep all water out during prolonged rain, standing water or immersion. The collar, tongue, seams, membrane and construction method can all affect water entry.

Whole-footwear water resistance is identified by WR. In the current category system, S6 builds on the S2 package with WR, while the S7 family combines the S3-type protection package with WR. The label and documentation for the exact model should establish the claim.

For wet work, also consider how long the footwear is exposed, whether water comes from above the collar, how the boot will dry between shifts and whether a moulded Class II boot is more suitable than leather or textile Class I footwear.

Do S1, S2 and S3 Safety Shoes Protect Against Electrical Hazards?

No. The antistatic property included in these categories is not the same as electrical insulation. Antistatic footwear is intended to help manage electrostatic charge under specified conditions; it must not be presented as protection against electric shock, live electrical work or arc flash.

Electrical hazards require a separate assessment and footwear designed, marked and documented for the applicable risk. The European standards framework separately addresses electrically insulating footwear, which is further evidence that an ordinary S1, S2 or S3 marking is not enough.

Safety warning: Never select ordinary S1, S2 or S3 footwear as electric-shock protection on the strength of the category code alone.

How Should You Choose Between S1, S2 and S3?

Start with the actual work environment rather than the product name. The following questions help narrow the category:

• Is the work mainly indoors and dry, or will the upper regularly meet moisture and splashes?
• Could nails, wire, glass, metal fragments or other sharp objects penetrate the sole?
• Is upper water resistance enough, or is whole-footwear WR required?
• Does the floor create a separate slip risk that requires the appropriate current slip marking?
• Are there additional heat, cold, metatarsal, chemical, welding or electrical hazards?
• Does the exact model fit the worker, duty cycle and walking or standing demands?

A common starting point is S1 for controlled dry indoor work, S2 for damp work without a sole-penetration requirement, and the S3 family where both moisture and underfoot sharp objects are relevant. This is only a starting point. The final choice should follow the workplace risk assessment and exact-model evidence.

How Can You Check the Marking on a Safety Shoe?

The complete marking is more useful than a product title or a CE logo by itself. Look on the tongue label, inner label, packaging and supplied documents for:

• the manufacturer or responsible economic operator and model identification;
• the applicable EN ISO 20345 edition;
• the category, such as S1, S2, S3S or S7L;
• any optional markings relevant to the risk, such as SR, FO, HRO, CI, HI, M or WR;
• the size and traceability or production information; and
• supporting evidence for the exact model and variant, including the declaration of conformity and certificate where applicable.

Older footwear may show SRA, SRB or SRC, while the current framework uses a different slip marking approach. Do not automatically rewrite an old S3 SRC claim as S3 SR. First check the standard edition and the actual evidence behind the model.

Frequently Asked Questions

Is S3 Better Than S1 or S2 Safety Footwear?

S3 is not automatically better for every job. It includes more protection against moisture and underfoot penetration than S1 or S2, but the correct category depends on the hazards. S1 may be suitable for dry indoor work, while S2 may fit damp environments without a penetration hazard. Other risks still require separate checks.

Are S2 and S3 Safety Shoes Waterproof?

Not necessarily. They include resistance to water penetration and absorption in the upper, but this is not the same as whole-footwear water resistance. For waterproof performance, check the WR marking and the relevant category, such as S6 or S7, for the exact model.

What Is the Difference Between S3, S3L and S3S?

All three build on the S2 package and include a cleated outsole, but they use different sole-penetration resistance routes. The suffix identifies whether the model follows the P, PL or PS route. Check the full label and documentation rather than treating the codes as interchangeable.

What Is the Difference Between S1P and S3 Safety Shoes?

Both include sole penetration resistance. S1P is based on the S1 package and is commonly considered for mainly dry workplaces with sharp objects underfoot. The S3 family also includes upper water penetration and absorption resistance and a cleated outsole.

Can S1, S2 or S3 Safety Shoes Have Composite Toe Caps?

Yes. The category code does not require one specific toe-cap material. Steel, aluminium or non-metallic toe caps may be used when the finished footwear meets the applicable requirements and the evidence covers that exact construction. Do not infer the toe material from S1, S2 or S3 alone.

Conclusion

The practical difference between S1, S2 and S3 safety footwear is the protection package they include. S1 is a common starting point for mainly dry work. S2 adds upper resistance to water penetration and absorption. The S3 family adds sole penetration resistance and a cleated outsole to the S2 package.

None of these codes replaces a workplace risk assessment or proves every optional property. Check moisture exposure, sharp objects underfoot, floor conditions and any special electrical, chemical or thermal hazards. Then verify the complete marking, standard edition and supporting documents for the exact footwear model.

For industrial or bulk requirements, ANBU can discuss available safety-footwear categories and model configurations. The requested category, optional markings, size range and destination-market documentation should be confirmed before the final model is approved.

 

References

1. ISO 20345:2021, Personal protective equipment — Safety footwear: https://www.iso.org/standard/73222.html
2. ISO 20345:2021/Amd 1:2024: https://www.iso.org/standard/86424.html
3. Commission Implementing Decision (EU) 2026/1279: https://eur-lex.europa.eu/eli/dec_impl/2026/1279/oj/eng
4. Regulation (EU) 2016/425: https://eur-lex.europa.eu/eli/reg/2016/425/oj/eng