"I bought these for eye protection, I had had one too many near misses whilst cycling in the woods. Ordinary specs do not prevent vegetation from making contact with the eye area, the Straight Jacket does. It completely covers the eye area and fits closely to the face, sitting securely on the bone around your eye socket. This prevents anything dangerous poking you in the eye. The clarity of the lens is first class and the transition works as well as expected (I have been wearing transitions lenses for 30 years). The frame iscomfortable and sits well on the face. It does not move despite all the vibration incurred by cycling at speed over bumpy trails. The side arms do not obstruct my cycle helmet and the helmet does not hold the frame in place; that is entirely down to the rubber -ike inserts in the side arms and the nose piece. If you work up a sweat on a cool day and then stop, the lens mist up on the inside, but this disperses quickly if you pull the frame away from the face slightly. The only thing I was disappointed with was how thick the lenses are. I am slightly short sighted and the thickness produces white rings around the periphery of the lens and make my eyes look a bit small. But these are meant to be providing safety for my eyes against impact, so a bit of thickness is to be expected. The Oakleys came in a drawstring bag that are for wiping the lens clean. The bagged specs fit inside a robust zipped case, very nice. If it wasn't for the \"bottom of a jam jar\" effect, I would have given these five stars."