Costa Del Mar Harpoon - Green Mirror 580G Lens - Masseys Outfitters Guide to Buying Sunglasses Virtually indestructible, these nylon frames offer the perfect blend of durability, comfort and style. (It's always nice to look good holding a huge trophy fish.) For serious outdoor adventures, you need polarized sunglasses that will stand up to the elements. You just found them. Hinge: Spring, Lens Size: L, Frame Fit: ML, Lenses: CR-39 or glass, [Rx-able] : Rx-able.