Moving from the Evergreen State to the Desert was a shock to my system. Where sunglasses were protection some days, now they are almost without exception, everyday, mandatory dress for me.
So I tend to like and find useful full coverage dark lens sunglasses that are equally appropriate for the mountains, climbing or skiing. A frame that if it doesn't offer optional side shields at least offers good frame design that blocks the rays from the side. The same glasses will hopefully have well designed lens to block the sun from above and reflection from below.
So a sunglass that only offers limited coverage is seldom useful to me. The "off sun" days or doing some thing where I want exceptional ventilation. Running is a great example. Around town another.
Enter the Swank SL....
From the Tofosi web site: