S3, S7, SRC?
Safety boot ratings
without the jargon.
The letters on the label matter. Here’s what they mean for wet feet, sharp objects and slippery floors.
Same shelf. Different protection.
Two pairs of black work boots can look almost identical and offer different protection. Start with the hazards your team faces, then use the certification to narrow your shortlist.
EN ISO 20345 covers safety footwear, including toecaps tested for 200-joule impact and 15 kN compression. You may see the 2011 edition or the newer 2022 edition, including amendment A1:2024. Read the year alongside the letters: some tests and markings changed.
Safety footwear ratings at a glance
| Rating | What it adds |
|---|---|
| SB | Basic safety-footwear requirements, including protective toecaps. |
| S1 | Enclosed heel, antistatic properties and heel energy absorption. |
| S1P / S1PL / S1PS | S1 plus the specified penetration-resistant insert. |
| S2 | S1 plus tested upper water penetration and absorption resistance. |
| S3 / S3L / S3S | S2 plus the specified insert and a cleated outsole. |
| S6 | S2 plus whole-footwear water resistance (WR). |
| S7 / S7L / S7S | The corresponding S3 category plus WR. |
S4 and S5 families cover all-rubber or all-polymeric footwear. Always read the full product specification and declaration of conformity.
“Water-resistant” needs a second look.
WPA concerns the upper material. It does not establish whole-boot water resistance. WR concerns the whole footwear. S7, S7L and S7S include WR; S3 alone does not.
Buying for wet outdoor shifts?
Check the whole-footwear claim and manufacturer’s instructions. Even footwear sold as waterproof has limits: depth, wear and water entering over the top all matter.
SRC and SR: read the year, too.
SRC belongs to the 2011 testing system. Under the 2022 system, basic slip testing is normally required; SR indicates an additional test on ceramic tile with glycerol. Test methods differ, so SR and SRC are not a direct performance ranking. Specialist footwear may carry Ø where slip testing is not applicable.
HSE advises checking performance against the actual floor and contamination. A laboratory marking cannot promise grip everywhere. Ask for relevant test results, trial footwear with wearers and keep tread clean.
Let’s decode S7S FO SR.
An illustrative 2022 label, broken into useful pieces:
For penetration resistance, P means a metal insert tested with a 4.5 mm nail; PL a non-metal insert with a 4.5 mm nail; PS a non-metal insert with a 3 mm nail. None means puncture-proof in every situation.
Other useful codes include HRO for outsole contact-heat resistance, CI for cold insulation, AN for ankle impact protection and M for metatarsal protection. Check the specific test limits; HRO does not make an entire boot heatproof.
Start with the shift you actually work.
Construction & outdoor maintenance
Consider sharp debris, uneven ground, wet conditions and any ankle or metatarsal hazards. Use the site specification to identify the required insert, water resistance and additional protection.
Warehousing & logistics
Check floors and spillages, then compare fit, weight and comfort through a working shift. A safety trainer can be worth considering where its full specification meets the assessed risks.
Engineering & workshop work
Identify oils, swarf, dropped components and any electrical hazards separately. FO concerns outsole material resistance; it is not a claim of grip on oily floors.
These are prompts for your workplace assessment, not blanket ratings for everyone in an industry.
The questions worth asking before checkout
Does a composite toecap mean the whole boot is metal-free?
No. Check the insert, fittings and complete construction. Ask for an explicit metal-free specification if your workplace requires it.
Is ESD the same as electrical-hazard protection?
No. ESD footwear helps control electrostatic discharge; it is not electrical insulation for live working. Antistatic, ESD and electrical-hazard claims serve different purposes and must match the task.
Must I replace boots simply because they say 2011?
The older year alone is not a reason to discard suitable footwear. Check certification, condition and workplace requirements with your supplier. Replace damaged footwear or footwear that no longer provides the required protection.
Is the highest S number always the best choice?
Choose the features your work needs, then check fit and comfort. A higher category number does not cover every specialist hazard.
Find the right pair for your team.
Use the guide to compare specifications across our range, including Rock Fall where available. Confirm the exact model’s current rating before ordering.
Safety boots
Safety trainersFor styles, sizing and everyday care, read our complete safety footwear buying guide.
Got a specification to match?
Tell us the job, working conditions, sizes and quantities. Our team can help you compare suitable options.
Talk footwear with our team →Original hivis.net buying guidance, checked against manufacturer and HSE information on 10 October 2026. Use the product documents and your workplace risk assessment for final selection.
Rock Fall: standards and testing →uvex: guide to EN ISO 20345:2022 →Strauss: footwear instructions and category definitions →HSE: selecting slip-resistant footwear →