This is my third pair of Smiths. I have the black frame with the polarized gray lenses in this style. I had the Vice and Projekt styles before these. These are perfect. They don't slip. The protection from the sun and snow glare is really great. They work on the mountain as well as they do in the line to pick up my monkeys from school. I felt like I needed some sunglasses that were more mom-like and I found them without sacrificing feeling like I still looked alright. These did it for me and I am very picky. You won't find a better pair.
F.Y.I. You can get different lenses through Smith. They have a bunch of choices for different light conditions.