Whether you're fly fishing on a mountain stream or sailing the high seas, the Smith Captains Choice Bifocal Polarized Sunglasses offer premium protection from the sun with crystal clear vision and convenient bifocal technology. Choose between 2. 0 or 2. 5 magnification options either way you get a 25mm wide magnifying segment that helps you see up close objects without interfering with your long range vision. That means you can go from tying a fly or checking your compass to gazing out at the horizon without skipping a beat. The Evolve frame is lightweight, yet sturdy, and is partially made with plant based materials to reduce the use of fossil fuels in manufacturing. An eight base curve offers ample coverage from the sun, and a hydroleophobic coating keeps your lenses from getting smudged.