The Smith Threshold Sunglasses give you non-slip frames and interchangeable lenses, so you can leap from whatever edge it is you walkwith clear vision and style. Snowy cornices, rocky mountain bike trails, or the edge of the dock, the Thresholds interchangeable lenses let you get the vision you need for every activity in one comfortable set of sporty shades. The Thresholds have Hydrophillic Megol rubber nose pads that wont give you pressure points on your schnozz and actually stick better when theyre wet with sweat or water. Basically, you can count on the Thresholds to stay on your face no matter what high-energy activity you engage in. See sizing chart for lens information.