How Does a Colour-Changing Jacket Work? Thermochromic, Photochromic & Reflective Explained

Seen a jacket that shifts colour under light and glows pure white at night, and wondered how it actually works? Here is the simple science behind colour-changing and reflective jackets — and how the Chromaflux Color-Changing Reflective Windbreaker does it.

Three different technologies (people mix them up)

Reflective: The fabric is coated with microscopic glass beads that bounce light straight back at its source. In daylight it looks like a soft neutral silver; the instant a phone flash or a car headlight hits it, the whole shell lights up bright white. This is the effect you see in night photos.

Thermochromic: Pigments that change colour with temperature (warm hands, sun, body heat). Fun, but the effect fades over time and with washing.

Photochromic: Pigments that change colour with UV light — the same tech as transition sunglasses. It shifts outdoors in sunlight and fades back indoors.

How the Chromaflux windbreaker works

Chromaflux is built on the reflective principle with an iridescent finish. By day it reads as a clean neutral silver. Under coloured light — club, stage, festival, RGB — the iridescent shell takes on that colour. And under direct white light at night, the whole jacket blazes reflective white. One jacket, three completely different looks depending on the light around you.

Does the colour change last after washing?

Because the effect comes from the reflective, iridescent fabric itself — not a temporary printed pigment — it does not wash out the way cheap thermochromic prints do. Hand wash or gentle cycle in cold water, no harsh bleach, hang to dry.

Is it just a costume, or actually wearable?

It is a genuine windbreaker: lightweight (~400g), waterproof and windproof, with an adjustable hood, full zip, and zip pockets. Everyday outerwear that happens to have a party trick — and real safety value for anyone out after dark.

Where to buy in India

The Chromaflux Color-Changing Reflective Windbreaker is available now from The Long Run Co. in sizes XS–4XL at ₹3,199 (MRP ₹3,999), with free shipping across India and Cash on Delivery.