Guide
EN ISO 20471 Explained: Hi-Vis Classes, Areas and Labels
EN ISO 20471 classes explained: minimum fluorescent and reflective areas for Class 1, 2 and 3, how to read the label, and who actually needs certified hi-vis.
EN ISO 20471 is the international standard for high-visibility clothing used at work. It sorts garments into three classes by the minimum area of fluorescent background and retroreflective material they show: Class 1 (0.14 m² fluorescent, 0.10 m² reflective), Class 2 (0.50 m² and 0.13 m²) and Class 3 (0.80 m² and 0.20 m²), with Class 3 giving the most visibility. If your job or site requires hi-vis, it will usually specify a class, and only a certified, labelled garment meets that requirement.
What EN ISO 20471 covers
The full title of the standard, ISO 20471:2013, is "High visibility clothing: test methods and requirements". It sets out:
- Colour performance of the fluorescent background material, which must stay within defined colour and brightness limits. Certified garments use fluorescent yellow, orange-red or red.
- Retroreflective performance: how much light the reflective material returns at defined angles.
- Minimum areas of each material, which define the class.
- Design and placement rules, so the wearer is visible from all sides, not just the front.
- Durability: performance after washing, plus tests such as tear and tensile strength.
The version you'll see on most labels in Europe is EN ISO 20471:2013+A1:2016, the 2013 standard with a 2016 amendment. A revision is being drafted through ISO and CEN, so check which edition a garment is certified to and look for updates in the coming years.
It's a standard for professional use in higher-risk situations: road and rail workers, emergency responders, airport ground staff, construction and logistics. It isn't aimed at runners or cyclists; Europe has a separate standard for that (see below).
The three classes explained
| Class | Min. fluorescent background | Min. retroreflective | Typical garments | Typical use |
|---|---|---|---|---|
| Class 1 | 0.14 m² | 0.10 m² | Some vests, trousers, bib trousers | Lower-risk, off-road settings |
| Class 2 | 0.50 m² | 0.13 m² | Vests, short-sleeve tops, some trousers | Road works, urban construction, car parks |
| Class 3 | 0.80 m² | 0.20 m² | Long-sleeve jackets, coveralls, jacket + trouser ensembles | High-speed roads, night-time highway work |
Source: area figures from published summaries of ISO 20471:2013+A1:2016 by testing and workwear organisations, including the Belgian textile research centre Centexbel.
Why Class 3 rarely means "a vest"
To put 0.80 m² of fluorescent fabric in view, you need sleeves, trouser legs, or both. Most vests simply don't have enough surface area. If your site requires Class 3, expect a long-sleeve jacket, a coverall, or a combination of jacket and trousers.
Class is set by the smallest size
The class is determined by the smallest size in a garment's size range, because a small vest has less fabric than an XXL one. A manufacturer can't certify a design as Class 2 because the XL version passes while the S version doesn't.
Ensembles: combining garments
Two garments worn together, typically a jacket and trousers, can reach a higher class than either achieves alone. The standard only accepts this when the supplier provides clear instructions on how that combined class is achieved, so check the user information rather than assuming.
How to read an EN ISO 20471 label
A certified garment carries a label with several pieces of information. Learn these and you can check any hi-vis item in seconds.
- The hi-vis pictogram (a stylised jacket with reflective bands) with the class number next to it: 1, 2 or 3.
- The standard reference, EN ISO 20471, often with the edition year.
- CE marking, showing it's sold as PPE in the EU. In Great Britain you may also see UKCA marking.
- Maximum number of cleaning cycles, if the manufacturer declares one, typically next to the care symbols. If no number is declared, the materials have been tested after five cleaning cycles. Either way, washing isn't the only thing that ends a garment's life.
- Size, care instructions and manufacturer details.
- A note to read the user information, which explains the class, ensembles, care and when to replace the garment.
Behind the label sits a certification process. Under the EU PPE Regulation (EU) 2016/425, high-visibility clothing is Category II PPE, so it needs an EU type examination by a notified body before it can carry the CE mark and be sold as PPE. Ask your supplier for the EU declaration of conformity if you need proof.
Who needs EN ISO 20471 clothing?
Whether you need certified hi-vis is decided by your employer's risk assessment, site rules, or sector requirements, not by the standard itself. Typical wearers include:
- road maintenance and highway workers
- rail track workers
- police, ambulance and fire crews on the road
- airport ground staff
- construction, warehouse and logistics workers near moving vehicles
- refuse collection and street cleaning crews
If you're in any of these roles, wear the class your employer specifies, and replace it when it's faded, torn, heavily soiled or past its declared cleaning cycles.
What about runners, cyclists and dog walkers?
EN ISO 20471 isn't intended for leisure users. Europe has a separate standard, EN 17353, for enhanced-visibility equipment in medium-risk situations such as cycling, running or walking near roads. It uses types rather than classes: Type A (fluorescent, for daylight), Type B (retroreflective, for darkness) and Type AB (both). Neither standard is legally required for leisure activities in the UK or EU, but the fluorescent-by-day, reflective-by-night logic is worth following regardless. The guide to reflective vs hi-vis clothing covers that in detail.
Buying checklist for certified hi-vis
- Confirm the class your job or site requires.
- Check the label shows EN ISO 20471, the pictogram and the class number.
- Check for CE (and, where relevant, UKCA) marking.
- Ask for the declaration of conformity if you're buying for a team.
- Check whether a combined class depends on wearing trousers and jacket together.
- Note the maximum cleaning cycles, if declared, and keep a wash count.
- Choose the colour your site or sector specifies; some sectors require a particular fluorescent colour.
- Replace garments that are faded, torn, contaminated or have damaged reflective bands.
Common misunderstandings
- "Any yellow vest is hi-vis." Not in the PPE sense. Only a certified, labelled garment meets a hi-vis requirement.
- "More reflective tape means a higher class." Class needs both the background and the retroreflective minimums.
- "Class 3 vests are the best vests." A vest that claims Class 3 should make you check the label and user information carefully.
- "Certified means safe." Certified hi-vis makes you easier to see. It doesn't stop vehicles; safe systems of work do that.
Where Titan Armor fits (and where it doesn't)
To be completely clear: the Titan Armor reflective hoodie is not certified to EN ISO 20471 (or ANSI/ISEA 107 or EN 17353). It's everyday clothing with a 360° reflective print that shines back in headlights and streetlight, and its colours are base fabric colours, not certified fluorescent backgrounds.
If your job or site requires certified hi-vis, wear certified hi-vis. Titan Armor is for visibility off the job: walking home, running, cycling to the shops or walking the dog, ideally combined with lights. There's an honest side-by-side in our reflective hoodie vs hi-vis vest comparison.
Related reading
- ANSI 107 vs EN ISO 20471, on how the US and European standards compare.
- Reflective vs hi-vis clothing, explaining fluorescent vs retroreflective.
- How reflective material works, covering glass beads, prisms and angles.
- How to wash reflective clothing, so reflective materials keep working.
Frequently asked questions
What are the three classes in EN ISO 20471?
Classes 1, 2 and 3 are based on minimum visible areas. Class 1 needs at least 0.14 m² of fluorescent background and 0.10 m² of retroreflective material, Class 2 needs 0.50 m² and 0.13 m², and Class 3 needs 0.80 m² and 0.20 m². Class 3 is the highest.
Which EN ISO 20471 class do I need?
Your employer's risk assessment or site rules decide. As a rough guide, Class 1 suits lower-risk off-road work, Class 2 is common for road works and urban construction, and Class 3 is for high-speed roads and night-time highway work.
Can a hi-vis vest be Class 3?
Usually not. Class 3 needs at least 0.80 m² of fluorescent background, which a typical vest cannot provide, so Class 3 normally means a jacket with sleeves, a coverall, or an ensemble such as a jacket plus trousers where the supplier states the combined class.
How many washes does EN ISO 20471 clothing last?
If the manufacturer declares a maximum number of cleaning cycles, it appears on the label next to the care symbols; if none is declared, the materials are tested after five cleaning cycles. Washing is not the only factor, so replace garments that are faded, torn or dirty regardless.
Is the Titan Armor reflective hoodie EN ISO 20471 certified?
No. The Titan Armor hoodie is everyday clothing with a reflective print, not certified high-visibility PPE. If your job or site requires EN ISO 20471, wear a certified garment.