Product details:
ROCKBROS Photochromatic glasses
Gender: Unisex
Attributes lenses: Photochromic
Color: Black Red, White Red, Blue Green
Weight: About 120g/pair
Lens Material: Polycarbonate
Material frame: Polycarbonate Frame
There are frames for fixing ordinary lenses
Protection cyclist eyes from UV-400 UV (100% of UV protection)
Non-slip nose pads is adjustable.
Purpose: cycling, skiing, sledding children, fishing ,runing ,and all outdoor sports
Note:Color change time:winter-1 minute,summer-40 seconds.
Speed depends on sunlight and UV intensity!

【TR-90 Frame】 TR-90 is a kind of polymer material with memory. It is the most popular ultra-light frame material in the world. It has the characteristics of super toughness, impact resistance and abrasion resistance, and low friction coefficient. It can effectively prevent the frame from breaking during movement. , Damage to eyes and face caused by friction.

【UV Cut】Our Sports Sunglasses all made of 100% UV 400 Protection Lens, Which is effectively filter and block glares to protecting your eyes against UV damage,blocks 100% harmful UVA & UVB Rays.

【COMFORTABLE & LIGHTWEIGHT】: The anti-skid nose pad and silicone temple make the sunglasses fit more comfortable on the bridge of your nose and above the ears. Only weight 29g, great to wear for long periods of time.

【FEATURES】: PC lens + TR frame make this sunglasses more durable, the lens is also easy to clean after get dirty. The air hole on the temples reduce the the wind resistance when you cycling, make you cycling without burden.

Photochromic lenses
The lens will changes with the the intensity of the ultraviolet light, the stronger UV light , the darken lens. Once you get into the indoor, the lens will return to transparent status.