Great quality lenses, but terribly fragile and weak frame. Snapped after a couple weeks of use at the fold joint. This is my third pair of Smith optics, and these are by far the worst regarding build quality. Disappointing. The lenses are superb, however.PROS:True Photochromic capabilitiesLightweightWon't fog due to ventingComfortable rubber nose pieceNon-slip arms and nose.Very flexibleFit under a full face helmetCONS:Narrower than they lookCould be a tight fit for large facesNON-polarizedExpensive for what they are @$90.00 USDThe shade change takes about a minute to darken to it's max and about 3 minutes to go from darkest to lightest/clearest. The shade change darkens enough to make them effective but the lack of a polarized lense means there's going to be some glare no matter what. These glasses fit under a Bell Super 3R with zero issues. The lense themselves are slightly longer from the nose down. Meaning they cover a bit more under your eye than the average glasses. They also naturally tilt forward slightly which is great for riding since your head is usually slanted downwards anyways.These glasses are so comfortable I've been wearing them regularly. Not just for riding.My goal was to find white framed sunglasses that had excellent uv protection, solid construction and perfect fit. I am loving these sunglasses as they meet all my criteria!The photochromic lenses work exceptionally well. The fit is near perfect. Protection is A+. A great pair of sport sunglasses.For supposedly being anti-fog, these things start fogging up immediately when I wear them with a mask. The vents don't do anything.Well spend money. Looks good nice lenses really comfortable highly recommended