Safety Shoe Ratings Explained: SB, S1, S2, S3

When buying safety shoes you will see abbreviations such as SB, S1, S1P, S2 or S3 printed on the box. These codes are not random; each is part of an international language describing exactly which level of protection the shoe provides and which working environment it suits. Choosing the wrong rating puts the worker at risk and can create unnecessary cost or lost comfort.

In this guide we explain safety shoe ratings step by step within the EN ISO 20345 standard. By understanding the difference between S1, S2 and S3, steel toe protection and what the extra codes mean, you can easily make the right safety shoe choice for your business.

Why Safety Shoes Are Essential

Feet are among the most frequently injured body parts in workplace accidents. Falling objects, sharp items penetrating the sole, slipping, hot surfaces, chemicals and electrostatic charge appear as different hazards in every sector. A standard sports or everyday shoe offers no protection against these risks.

Safety shoes are tested and certified to withstand specific hazards from the sole to the toe cap. For the worker this means fewer accidents and comfortable long hours on their feet; for the employer it means meeting legal obligations and maintaining workforce continuity.

EN ISO 20345 and Basic Protection

The safety level of work footwear is defined by the international EN ISO 20345 standard. It sets the minimum requirements a shoe must meet to be classed as a 'safety shoe'. The most fundamental requirement is a protective cap in the toe area that resists impact.

Under the standard, the protective toe is tested against an impact at a set energy level, accepted as a standard value of 200 joules. Whether made of steel or composite, the toe of an EN ISO 20345 certified shoe offers the same basic impact protection. Steel toes are heavy and durable, while composite toes are lighter and can pass through metal detectors.

A shoe without EN ISO 20345 certification, however sturdy it looks, is not officially considered a safety shoe.

SB, S1, S1P, S2 and S3 Ratings

The ratings build up gradually according to the features added on top of the basic toe protection. The list below summarises what each rating generally covers:

• SB (Basic): The most basic level, providing only 200 joule toe protection. No additional comfort or sole features are guaranteed.
• S1: Adds a closed heel area, antistatic (ESD-like static discharge) properties, an energy-absorbing heel and an oil/hydrocarbon-resistant sole on top of SB protection. Generally suited to dry indoor environments.
• S1P: Adds penetration resistance (P) to the S1 features, protecting against nails or sharp objects passing through the sole. Often preferred on construction and assembly sites.
• S2: Adds a water-repellent, moisture-resistant upper to the S1 features. Suitable for environments where feet may get wet.
• S3: The most comprehensive common rating. It adds penetration resistance and a profiled (cleated, slip-reducing) sole to the S2 features. The standard choice for wet, muddy and puncture-prone tough environments.

In short: S1 and S2 are aimed at indoor and lighter environments, while S1P and S3 are designed for penetration risk and outdoor conditions. The essence of the S1, S2, S3 difference revolves around water resistance and penetration protection.

Extra Codes: WR, HRO, CI, HI, SRC

The additional letter codes seen alongside the base rating indicate extra protection against specific conditions. Consider these too for the right choice:

• WR: Water resistance of the whole shoe.
• HRO: Heat resistance of the outsole surface to hot contact; important for work on hot floors.
• CI: Insulation against cold; suitable for cold storage or open winter sites.
• HI: Insulation against heat; preferred for hot environments and work around ovens.
• SRC: The highest slip-resistant sole level, indicating slip resistance tested on both ceramic/water and steel/glycerine floors.

The Right Rating by Industry

The right safety shoe choice is determined by the risks of the working environment. Some general guidance by sector is as follows:

• Construction and site work: S3 (or at least S1P) is usually preferred due to nail penetration and rough ground.
• Food and kitchen: Water-repellent S2 and SRC slip-resistant soles stand out for wet, slippery floors; a cleanable upper matters for hygiene.
• Industry and manufacturing: S1P or S3 against falling parts and oil risk; HRO/HI extras are considered where hot surfaces exist.
• Logistics and warehouse: Lightness and comfort matter for long hours standing; S1 suits dry areas, S3 suits outdoor loading zones.

Size, Comfort and Care

Even the highest safety rating is ineffective if the shoe does not fit properly. Trying sizes towards the end of the day, when feet are slightly swollen, gives a more accurate choice. In shoes with protective toes it is important to have a few millimetres of space so the toes do not touch the cap.

For comfort, a breathable lining, an energy-absorbing sole and appropriate sole stiffness are decisive. For care, cleaning the shoe regularly, drying it at room temperature when wet and monitoring sole wear extend its life. A worn slip-resistant sole reduces protective value regardless of the rating.

At Mafix Tekstil we help businesses correctly match safety shoe ratings to their sector and risk level, offering suitable solutions for wholesale orders. Choosing the right rating is the most reliable way to protect worker safety and budget efficiency at the same time.