I ordered these lenses with a pair of Tralyx XL sunglasses and since had been using the replacement lenses interchangeably with the original ones. It is amazing how these lenses adjust to changes in light conditions. If you wear them in the sun, the lenses will turn completely black. On the contrary, they will become transparent if it’s dark or cloudy. The transition between the two states is so smooth that your eyes won’t even feel the difference. They also offer great protection from wind.
Purchased my first XL’s and really pleased with them. R&D has done a great job of improving the photochromic lens during snow conditions, as the brightness of the snow doesn’t ‘confuse’ the lens when there is flat light or darkening conditions.
These lenses cut the intense glare you get off of new snow on a bluebird sunny day while still being able to pick up terrain details on flat light days. They have also been great moving between the shaded trees to open sunny trails. A welcome surprise with the range of this lens.