What Are The Standard European Classifications For Safety Footwear? A Guide To En Iso 20345

Understanding European safety footwear classifications is straightforward once you recognize them as a progressive system of protection. Governed by the EN ISO 20345 standard, these classifications start with basic toe protection (SB) and add specific features layer by layer—such as anti-static properties (S1), water resistance (S2), and puncture resistance (S3)—to match the demands of different work environments.

The core principle is simple: each safety classification builds upon the last. The "S" number on your footwear tells you exactly which hazards it is designed to protect you from, eliminating guesswork and ensuring you have the right level of protection for your job.

What are the standard European classifications for safety footwear? A Guide to EN ISO 20345

The Foundation: Breaking Down the Core Classifications

The most common safety ratings for leather or fabric-style safety boots and shoes are SB, S1, S2, and S3. Each level incorporates the features of the level below it, adding a new layer of defense.

SB: The Basic Standard

The SB rating signifies that the footwear meets the most fundamental safety requirement: a toe cap capable of withstanding 200 joules of impact. This is the baseline for all safety footwear.

S1: Protection for Dry Environments

An S1 rating includes the SB toe cap and adds two key features: a fully enclosed heel and anti-static properties. This makes it suitable for indoor work where there is no risk of water exposure.

S2: Adding Water Resistance

Footwear rated S2 has all the features of S1 but also includes a water-resistant upper. It is designed to prevent water penetration and absorption, making it ideal for those working in damp conditions or outdoors.

S3: The All-Rounder for Demanding Environments

The S3 classification is one of the most comprehensive. It incorporates all S2 features and adds a penetration-resistant midsole to protect against sharp objects underfoot, as well as a cleated outsole for enhanced grip. This is a common standard for construction and heavy industrial sites.

Specialized Classifications for Wet Environments

For roles that require fully waterproof footwear, such as work in deep puddles or with liquids, the classifications shift to S4 and S5. These typically apply to all-rubber or polymeric boots, like Wellingtons.

S4: Waterproof and Anti-Static

An S4 boot is fully waterproof and leak-proof. It includes all the features of the S1 rating—a 200-joule toe cap, enclosed heel, and anti-static properties—within its molded polymeric or rubber construction.

S5: Maximum Wet Environment Protection

The S5 rating is the highest level of protection in this category. It has all the features of an S4 boot but adds a penetration-resistant midsole and a cleated outsole, making it the waterproof equivalent of the S3 standard.

Understanding the "P" Designation

You will often see classifications like SBP or S1P. The "P" is not a lesser standard; it is a specific addition that indicates protection from a particular hazard.

What "P" Means

The letter "P" added to any rating signifies that the footwear includes a penetration-resistant midsole. This is the same feature that comes standard in S3 and S5 boots.

Common Variations: SBP and S1P

An SBP boot is a basic SB boot with an added puncture-resistant midsole. More common is the S1P rating, which offers S1 features (anti-static, enclosed heel) plus penetration resistance. S1P is a very popular choice for tradespeople like electricians and plumbers who work indoors but still face risks from nails and other sharp debris.

How to Choose the Right Safety Footwear

Your choice should always be based on a risk assessment of your specific work environment. The goal is to match the boot's features to the hazards you face daily.

If your primary focus is working indoors in a dry environment: An S1-rated boot provides the necessary toe, heel, and anti-static protection.
If your primary focus is indoor work with a risk of sharp objects on the floor: The S1P classification is the most practical and popular choice.
If your primary focus is outdoor or construction work with multiple hazards: The S3 rating offers comprehensive protection against impact, water, and punctures.
If your primary focus is working in standing water or requiring fully waterproof boots: You must choose between S4 (waterproof) and S5 (waterproof with puncture resistance).

By understanding these codes, you can confidently select footwear that provides the precise protection you need to work safely and effectively.

Summary Table:

Classification	Key Protective Features	Ideal For
SB	Basic 200-joule toe cap	General indoor work, minimal hazards
S1	SB features + enclosed heel, anti-static	Dry indoor environments (e.g., workshops)
S1P	S1 features + penetration-resistant midsole	Indoor work with sharp debris risk (e.g., electricians)
S2	S1 features + water-resistant upper	Damp or outdoor conditions
S3	S2 features + penetration-resistant midsole, cleated outsole	Construction, heavy industry, multiple hazards
S4	S1 features in a fully waterproof construction (e.g., rubber boots)	Wet environments, standing water
S5	S4 features + penetration-resistant midsole, cleated outsole	Maximum protection in wet, hazardous conditions

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Let us help you source reliable, compliant safety footwear. Contact our team today to discuss your requirements and get a quote!