EN 471:2003 is the European standard for high visibility
The High visibility warning clothings are aiming to signal the presence of the wearer visually in daylight as well as under illumination by lights at night without ambiguity in any circumstances.

Test methods and requirements for clothes signal to highvisibility to use professional.

Certified by this standard clothing to visually indicate the presence of a user, to detect it and well see in dangerous situations.

Performance requirements cover the color of the garment, retro reflection, minimal surfaces and materials positioning. There are 3 signalling garment classes defined based on surfaces used "background material" (fluorescent material color) and "retro reflective material" on smaller range.