PolarizedPlus?2 Technology All Maui Jim Sunglasses block glare and UV from all angles, manage blue light, and then boost colors for unmatched color, clarity, and contrast. BiFocal Power of +1.5, +2, and +2.5 are available. *If not in stock, can be ordered at no additional cost* Polycarbonate Lenses For intense sports activities and active lifestyles, Maui Jim Polycarbonate lenses are optically correct to ensure crisp optics. They're lightweight, comfortable, extremely impact resistant, and feature CLEARSHELL scratch-resistant coating. High-Grade Nylon Lightweight and tough it provides superior fit and comfort. Pin Hinges Anti-corrosive, stainless steel pin hinge offers lightweight strength. Rubber Nose Grips Resist the will of gravity and keep your glasses in place. Flawless Finishes High-gloss finish. Saltwater Effectiveness Lens treatments and frames are saltwater safe. ***IMPORTANT***LENS INFORMATION: Natural Grey Lens: Offers contrast and the highest available light reduction. Suitable for all light conditions, especially bright, direct sunlight. 12% light transmission. Bronze Lens: Perfect for low-light conditions, or for those who like a subtle bronze hue for everyday wear. Offers excellent contrast. 16% light transmission.