EN ISO 20471 hi-vis classes explained
EN ISO 20471 is the international standard for high-visibility workwear. It sets three classes by the minimum area of fluorescent background and retroreflective tape — Class 3 is the most visible and is typically required for roadside and rail work, Class 2 for many site and logistics roles, and Class 1 for lower-risk environments.
Minimum visible material by class
Areas are minimums for the smallest certified size. Combining garments (for example a Class 2 jacket with Class 1 trousers) can achieve Class 3 as an ensemble when certified together.
| Class | Fluorescent background | Retroreflective tape | Typical garments |
|---|---|---|---|
| Class 3 | 0.80 m² | 0.20 m² | Long-sleeve jackets, coveralls, vest + trousers combined |
| Class 2 | 0.50 m² | 0.13 m² | Vests, waistcoats, short-sleeve tops |
| Class 1 | 0.14 m² | 0.10 m² | Trousers alone, some harnesses |
Who needs which class?
- Highways and rail: Class 3 is generally specified by the client or infrastructure owner (for example Network Rail and National Highways requirements). Always follow your contract specification.
- Construction sites and yards: Class 2 is common as a minimum; many principal contractors require Class 3 or long sleeves.
- Warehousing and logistics: Class 2 vests or tops are widely used around moving vehicles.
Adding your logo without breaking compliance
Logos must not reduce the fluorescent or reflective area below the class minimum. Place branding on the back panel or chest away from the tape, keep it reasonably sized and use a heat-applied transfer rather than embroidery so the fabric is not perforated.
Common questions
- Does washing affect hi-vis certification?
- Yes. Certified garments state the maximum number of wash cycles on the label. Beyond that, fluorescence and reflectivity may no longer meet the standard.
- Is EN 471 still valid?
- EN 471 was replaced by EN ISO 20471 in 2013. Buy garments certified to EN ISO 20471.