European Standard · Protective Clothing
EN ISO 20471 – High-Visibility Clothing: Classes, Requirements and Selection
EN ISO 20471 is the European standard specifying requirements for high-visibility clothing that visually signals the wearer’s presence in hazardous environments, such as roadworks, warehouses and low-light industrial sites, to both operators of vehicles and machinery and to other workers.
1. Scope
EN ISO 20471 applies to garments made from fluorescent background material and retroreflective tape designed to provide conspicuity in daylight and under artificial lighting. It defines three classes of garments (Class 1, 2 and 3) based on the minimum area of fluorescent and reflective material required.
2. Exclusions & Related Standards
- Often combined with head protection under EN 397 and footwear meeting EN ISO 20345 on active work sites.
- Built on the general requirements of EN ISO 13688 for protective clothing.
- Does not cover flame-resistant high-visibility clothing, which additionally requires compliance with EN ISO 11612 or similar flame protection standards.
3. Key Requirements & Marking
Garments are marked with the standard number, class (1, 2 or 3) and pictogram. Class 3 offers the highest visibility with the greatest area of fluorescent and reflective material, typically required for high-risk roadside work, while Class 1 provides the minimum acceptable visibility for lower-risk environments.
4. Testing Overview
Testing measures the minimum surface area of fluorescent background material and retroreflective tape, colorfastness of the fluorescent fabric, retroreflective performance after repeated washing, and placement of the reflective bands to ensure visibility from multiple angles.
5. Selection Guide
Class selection depends on the risk assessment of the work environment: Class 3 is typically mandated for workers exposed to fast-moving traffic such as highway maintenance, Class 2 suits general site work with moderate vehicle exposure, and Class 1 may be adequate for lower-risk indoor or controlled environments.
6. Inspection, Care and Maintenance
- Wash according to the care label; excessive washing beyond the rated cycles reduces retroreflective and fluorescent performance
- Replace garments once fluorescent colour has visibly faded or reflective tape is cracked, peeling or dulled
- Avoid contaminating garments with oil, paint or solvents, which can permanently dull fluorescent brightness
- Store away from direct sunlight for long periods when not in use to slow fluorescent fading
7. Frequently Asked Questions
What is the difference between Class 1, 2 and 3 high-visibility clothing?
The classes differ in the minimum area of fluorescent and reflective material, with Class 3 offering the greatest visibility and generally required for the highest-risk roadside or low-light work.
Can high-visibility clothing also be flame-resistant?
Yes, but it must additionally meet a flame-resistant standard such as EN ISO 11612, since EN ISO 20471 alone only addresses visibility, not heat or flame protection.
How many washes can high-visibility clothing withstand?
Manufacturers specify a maximum number of wash cycles after which retroreflective performance may fall below the required standard, so garments should be replaced once that limit is reached.
Is Class 3 always required for roadwork?
Many national road authorities mandate Class 3 for workers near live traffic, but requirements vary by country and specific risk assessment, so local regulations should always be checked.
Does high-visibility clothing work in the dark without external light?
No, retroreflective tape needs an external light source such as vehicle headlights to reflect light back to the source; fluorescent fabric primarily improves daytime visibility.