EN ISO 20471 is a standard for high-visibility clothing. The classification on the garment helps describe its visibility performance; it does not, by itself, tell you which item is appropriate for every workplace.
What the classes mean
The standard uses Classes 1, 2 and 3. Class 3 has the highest requirements within this classification. Fluorescent background material, retroreflective material and garment design contribute to the result.
Why the exact size matters
Check the label and manufacturer’s information for the model and size being ordered. Smaller sizes can have a different class because the available visible area differs. Do not transfer a classification from one colour or size to another without checking.
Garments worn together
A jacket and trousers do not automatically create a higher combined class. Use a combination only on the basis of the manufacturer’s declared information, and follow the wearing and fastening instructions.
Branding and layers
Decoration can reduce the visible background area or interfere with the design. Check the allowed size and position before applying a logo. Bags, other clothing and how the garment is worn can also obscure the intended visibility.
Choosing for a job
Take the required class and any site or sector rules from the workplace assessment. Compare products against that brief, including fit, weather needs and compatibility with other equipment. A coloured identification vest should not be assumed to be certified hi-vis PPE.
Keep the evidence with the order
Retain product codes, relevant documentation and approved branding details. Review worn or damaged garments and follow the care instructions. The product label and manufacturer’s declaration are the reference for the exact item being supplied.