After hours of research on the Tifosi website about lens features, I felt these would be the best for daytime running.  These feature the Fototec lens, which will darken or lighten with the amount of sunlight.  Normally, I would have gone with a mirrored or black lens, not hunters orange, but the ONLY reason I went with these is because of the light response range: 45% (lightest) to 18% (darkest).<br /><br />When I got them in the mail and put them on, the orange tint was absolutely terrible and I was ready to send them back.  Plus, I didn't like that you could see my eye through them.  I felt like I was wearing shooting glasses!  However, I took them out for one run, and within minutes of being in full sunlight, I changed my mind completely.  These really bring out the color in urban environments, and it was most noticeable when I took them off to wipe sweat from my forehead, the world took on a blue hue and detail was less apparent.<br /><br />So, I still wish I had black or reflective lenses, but these are certainly a keeper.  Highly recommended to any outdoor runner.<br /><br />By the way, this listing loses a star because the seller, Bois Blanc Sports, overcharged me, I believe.  I paid $72 for these, which was still that price at the time of this writing, but the glasses came out of the sealed box with a $65 tag affixed to one of the arms by the manufacturer.  This makes me think Bois Blanc Sports is charging more than MSRP on top of whatever dealer cut they're receiving.