Versatile and look pretty good too
I use these shades year round...summer biking and alpine climbing, winter ski touring. The mix of lenses are great, with a polarized sunglass lense, a clear one, and a rosey goggle type lens. I find myself using the rosey lens almost all winter in flat light skiing and in the trees as goggles are just too warm for me. But in the summer you can swap into the clear lens to keep the mud and grit out of your eyes for the coastal mountain biking I do. I found these things pretty darn durable, and even when I did manage to beat them up a bit too much, Smith replaced them no questions asked!