Pay Zero Sales Tax on The Smith Threshold Sunglasses are poised to hurl off whatever edge it is you walk. 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 sports shades. The Thresholds have Hydrophillic Megol rubber nose pads that won't give you pressure points on your schnozz and actually stick better when they're wet with sweat or water. Basically, you can count on the Thresholds staying on your face no matter what high-energy activity you're engaged in.