Photochromic lenses adjust to changing light conditions by getting lighter or darker depending on the amount of UV light present. The more UV light—or the brighter the conditions—the darker the lens becomes, and vice versa. Julbo calls its photochromic technology REACTIV.
REACTIV photochromic technology is helpful when the weather change, if you're recreating early or late in the day or if you're in and out of the woods frequently. Since the lenses change how light and dark they are, don't need to switch from one lens to another or take off your sunglasses/goggles as conditions change.
Julbo offers a variety of REACTIV photochromic lenses, which are available in polarized and non-polarized options.
Read more about REACTIV photochromic technology here.
Read more about the benefits of polarized lenses here.