I bought some nike ones that have changeable lenses. They where around 100 bucks for them. Worth the money in my opinion, they came with the grey polarized lenses and orange shooting lense. I went back later bought the brown polarized lenses for cloudy days. They come with a case, as long as you place them back in the case each time I dont see why they wouldnt last. I have dropped my in gravel and no scratches yet. And if for some reason the lenses did, just buy replacement ones.