This is the hi vis equivalent of the glove rules we covered in our guide to EN388 glove ratings. Same idea, different bit of kit. Here is what you need to know without the jargon.
What EN ISO 20471 actually is
EN ISO 20471 is the European standard for high visibility clothing. It replaced the older EN 471 standard and it sets out how hi vis garments must be designed, how much visible material they must carry, and how they have to perform when tested. If a garment is certified to it, that is your assurance the item does what it claims in daylight and under headlights at night.
Certified hi vis is classed as Category II PPE and should carry CE or UKCA marking along with the standard number on the label. If there is no label, or the label has washed away, you cannot treat the garment as compliant. Simple as that.
The two things the standard measures
Every hi vis garment does two jobs, and the standard scores both.
The first is the fluorescent background material. That is the bright yellow, orange or red fabric that makes you stand out in daylight. The second is the retroreflective tape, the silver bands that bounce light straight back at a driver in the dark. A garment needs enough of both to qualify, and the more it carries, the higher the class.
The three classes, in plain terms
EN ISO 20471 sorts garments into three classes based on the minimum area of each material. Here is what each one means and where it belongs.
Class 1: low risk
The entry level. It needs at least 0.14 m² of fluorescent material and 0.10 m² of reflective tape. Think low traffic, low speed environments such as enclosed yards, car parks or warehouses where vehicles are slow and few. A basic vest often sits here.
Class 2: moderate risk
The middle tier and the one most Irish sites live in. It needs at least 0.50 m² of fluorescent material and 0.13 m² of reflective tape. This covers the bulk of construction work, ports, rail yards and busier sites with moderate traffic or machine movement. Most quality hi vis vests and many polo shirts and t shirts sit at Class 2.
Class 3: high risk
The highest level of visibility. It needs at least 0.80 m² of fluorescent material and 0.20 m² of reflective tape. This is for low light conditions such as darkness, rain and fog, and for anyone working near fast moving traffic. As a rule of thumb, if vehicles are passing at more than 60 km/h, you are in Class 3 territory, which means motorways, major roads and live rail.
There is one extra rule worth knowing for Class 3. A single garment can only reach it if it covers the torso and has either sleeves with reflective bands or full length trousers with bands. A standalone vest, no matter how much tape it carries, generally tops out at Class 2.
The combination trick most buyers miss
This is the part that catches people out. You do not always need one expensive garment to reach Class 3. You can combine two certified garments and hit the higher class together. A Class 2 jacket worn with a certified pair of Class 2 trousers can meet Class 3 as an ensemble.
The catch is that both garments must be properly labelled and certified, and the supplier needs to confirm the combination achieves it. Mixing a random vest over an old jacket does not count. If you want the practical version, pair our hi vis jackets and bodywarmers with our hi vis trousers to build a Class 3 setup for crews working in the worst conditions.
Which class does your crew actually need?
The standard does not pick for you. Under Irish health and safety rules the employer carries out the risk assessment and selects the right level for the job. As a quick guide:
- Enclosed yard, warehouse or slow pedestrian areas: Class 1 is usually enough.
- General construction, ports and busier sites: Class 2 is the working standard.
- Roadworks, motorway and major road jobs, live rail, or any night and poor weather work: Class 3.
For most teams the honest answer is a Class 2 base with Class 3 available for the higher risk shifts. You can browse the full range across hi vis vests, hi vis polos, hi vis t shirts and hi vis fleeces and softshells. If you run a crew on or near the network, our railway hi vis range is built for that environment.
The branding catch every business should know
Here is one that surprises a lot of companies. When you add a logo or printed text to a hi vis garment, any area of background or reflective material that the branding covers is removed from the certified minimum. Put a large print across the back of a vest that was only just over the Class 2 threshold and you can quietly drop it below compliance.
It is the reason branding hi vis is a job for someone who understands both the decoration and the standard. We have been doing exactly that from Limerick since 1994, and we place logos so your kit stays compliant and still looks sharp. We can apply your branding by embroidery, screen print, DTF or heat transfer depending on the garment and the run size. If you want the wider case for getting your team into branded kit, we made it here in why branded workwear is the smartest marketing you will ever buy.
Do not forget the washing rules
Hi vis does not last forever. The reflective tape and the fluorescent colour both degrade over time, and the standard requires the maximum number of wash cycles to be stated on the label. Once a garment is faded, grubby or past its wash count, it is no longer doing its job, whatever the original class was. Build replacement into your kit budget rather than waiting for an inspection to flag it.
The quick buyer checklist
- Check the label for EN ISO 20471 and the class number before you buy.
- Match the class to the job, not the other way round. Vehicle speed and light conditions decide it.
- Remember a vest alone is usually Class 2. Combine certified garments for Class 3.
- Factor branding into compliance so a logo does not drop you below class.
- Replace faded or worn kit before it stops protecting your team.
Need a hand kitting out a crew or working out which class a job calls for? That is what we do every day for construction and engineering teams across Munster. Take a look at our construction and engineering workwear page, browse the full hi vis range, or get a B2B quote and we will sort the rest.
