These slip fototec, glasses work well for daytime road cycling, In fact , i loved them until I noticed that practically over nite, I developed hairline cracks close to the bridge of nose piece area, on the lenses.itself. I have never had this problem before with road cycling glasses so I am assuming that the pair of glasses I got were defective and or that one size glasses do not fit all because i have only owned these glasses for 2 weeks and have used them minimally.