Flying Fisherman Square Duval Sunglasses with AcuTint Lenses. Perfect for Fishing and Outdoor Sports. Matte Black Frame/Smoke-Blue Mirror Lens, Medium. Polarized triacetate lenses improve visibility for any activity. They are scratch resistant, lightweight and durable so you can take them everywhere. Frames are made from TR90 Grilamid, an extremely tough polymer designed for durability in any condition, with non-slip, nose and temple pads for added comfort and a stay put fit. Enhances color contrast, sharpens clarity and colors, and blocks 100 of harmful UVA and UVB rays. Polarizing filter eliminates glare, and allows you to see below the water's surface.