TR90 Cycling Polarized Sunglasses

These TR90 cycling sunglasses are described as photochromic and polarized, with adjustable non-slip nose pads. The source lists a light-transmission range of 80% to 18%, changing from light gray to dark gray under stronger UV exposure. The color-change notes below explain the listed operating conditions; the UV-protection claim has not been independently verified here.

Listed functions: photochromic and polarized lenses; supplier claims UV protection, with no test report supplied
Light transmittance: 80% -18%
Color: 80% is light gray when UV is low, 18% is dark gray when UV is high
Adjustable non-slip nose pads.
Please note:

Discoloration rate is related to UV intensity and temperature (if UV intensity and temperature are low, the discoloration speed will be slower)
Glass will only change color under UV light. Does not change color under ordinary incandescent lamps.