I went for a ride late yesterday afternoon. It was sunny when I started so I used the smoke lenses. Pretty soon it became overcast and getting a bit foggy, so I switched to the yellow lenses. Later as it got dark, I wondered if the yellows would be better or the clears. I stayed with yellow for a while, but when I stopped to pop in the clears, I decided the clears were an improvement once it got dark enough. When I set out later in the day I velcro my wedge glasses case to my stem so I can change lenses easily. Better Fred than dead!