If a high-visibility vest remains continuously exposed to direct solar radiation, what effect does this have on it?

Question

DentroTest · Accepted Answer

High-visibility vests are made of fluorescent materials and retroreflective bands that are highly sensitive to the sun's ultraviolet (UV) radiation. If they are left continuously exposed to direct sunlight (for example, on the dashboard or hung on the seat back in the cab), they progressively lose both their daytime fluorescence and their ability to reflect light at night, becoming useless for ensuring the driver's safety. It is therefore advisable to keep the vest in an easily accessible place inside the cab, but sheltered from the sun.

If a high-visibility vest remains continuously exposed to direct solar radiation, what effect does this have on it?

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