Uvea has created the first zipper that reacts to UV rays by changing color. The UV index is a scale for measuring the intensity of ultraviolet radiation emitted by the sun, and the risk it represents to health (sunburn, cataracts and skin cancer). The higher the value, the greater the risk. Zip receives ultraviolet rays in the same way as your skin, but reacts immediately by changing color. So, the more violet the zip, the stronger the ultraviolet rays, and the more you need to protect yourself.