Buy safety footwear and you will see codes like SB, S1, S3 or S7 on the product. They are not marketing labels. They are a shorthand for the protection a boot is certified to offer, set out under the European safety footwear standard. Understanding them takes the guesswork out of buying, and helps you match footwear to the real hazards your team faces. Here is how the system works.
1. The basics: how the ratings work
All certified safety footwear starts from one shared requirement: a protective toecap that withstands a defined impact and compression. From there, the ratings stack up extra features, such as a fully enclosed heel, resistance to fuel and oil, water resistance and a penetration-resistant midsole. The higher the rating, generally the more protection is built in. The right choice is not always the highest rating; it is the one that matches your work.
One important point on terminology: the safety footwear standard has been updated over the years, so you may see both older and newer category codes in the market at the same time. The familiar SB to S3 codes below are the ones most buyers still recognise and ask for. Always check the specific product's stated certification rather than assuming, and confirm it against your own risk assessment.
2. SB: the basic safety toecap
SB is the foundation. It means the footwear has a protective toecap that meets the basic impact and compression requirement. An SB boot protects your toes, but on its own it does not promise the extras that the numbered ratings add, such as antistatic properties or a closed heel area. SB is fine where toe protection is the main concern and other hazards are low, but most worksites call for one of the S ratings below.
3. S1 to S3 at a glance
The numbered ratings build on the basic toecap by adding a defined set of features. This table summarises what each commonly includes, so you can see the step up from one to the next.
| Rating | Typically includes | Often used for |
|---|---|---|
| SB | Protective toecap (basic impact and compression) | Low-risk tasks where toe protection is the priority |
| S1 | Toecap, closed heel, antistatic, energy-absorbing heel, fuel/oil-resistant sole | Drier indoor environments such as workshops and warehouses |
| S2 | Everything in S1, plus water-resistant upper | Damp settings where feet meet some moisture |
| S3 | Everything in S2, plus a penetration-resistant midsole and a cleated (grippy) outsole | Construction, groundworks and outdoor sites with nails and debris underfoot |
For most trade and construction work outdoors, S3 is the common choice because it adds the midsole protection and the deeper tread that wet, uneven and debris-strewn sites demand. Indoors, in drier conditions, S1 or S2 is often enough.
4. A note on the newer ratings
You may also come across newer category codes that have been introduced as the standard evolved, covering things like footwear made without certain components or with updated slip and protection requirements. These can sit alongside the traditional SB to S3 codes. The principle is the same: the code is a summary of certified features. If you see a rating you do not recognise, check the product detail or ask us, and match it to your risk assessment rather than guessing.
5. Extra markings you might see
Beyond the main rating, footwear often carries extra letter codes for specific properties. Common ones include:
- Slip resistance markings, indicating the surfaces and conditions a sole has been tested against.
- HRO for heat-resistant outsoles, useful where there is hot ground or sparks.
- CI, HI for cold or heat insulation of the sole.
- WR for whole-boot water resistance, a step beyond the water-resistant upper in S2 and S3.
- M for metatarsal protection over the top of the foot.
You will not need all of these. They matter only where the hazard is present, which again comes back to your risk assessment.
6. How to choose for your site
Work through it in order:
- Start with the hazards. What is underfoot, overhead and around the feet? Wet ground, sharp debris, hot surfaces, slippery floors? Your risk assessment is the source of truth.
- Pick the rating that covers them. Use the table above to match the hazards to a rating. When outdoor and construction risks are present, S3 is the usual baseline.
- Then think about comfort and fit. The safest boot is the one your team will actually wear all day. Composite toecaps are lighter than steel and do not conduct cold; weight and fit make a real difference over a long shift.
- Try before you commit. Fit varies between brands and styles. Free samples let everyone check size and comfort before you order for the whole team.
Safety footwear ratings are a guide to certified features, not a substitute for your own risk assessment. Always confirm the specific product's certification and choose footwear appropriate to the hazards on your site. If you are unsure, ask us and we will help you match a pair to the job.
7. A quick checklist
- Identified the hazards from your risk assessment
- Matched those hazards to a rating (S3 is the common outdoor baseline)
- Checked for any extra markings you need (slip, heat, water, metatarsal)
- Considered weight, comfort and toecap material for all-day wear
- Ordered free samples to confirm fit before committing
Get the rating right and your team is protected, comfortable and compliant. Browse our safety boots and work footwear range, or tell us your trade and we will point you to a sensible option.
