Cocoons are the best sunglasses that are designed to fit over your prescription glasses. The polarized lenses have advanced 360° UV protection to block glare and improve contrast, allowing your eyes to remain relaxed and focused on the task at hand. These attractive sunglasses are perfect for anyone wishing to reduce the sun's effects that can potentially cause macular degeneration. Glasses offered in neutral sand color and in 3 sizes and in 4 filter shades—amber, gray, yellow and copper. Medium fits glasses frames measuring up to 5 1/4" x 1 1/2"; large up to 5 3/8" x 1 7/8", and extra large up to 5 1/2" x 2". Amber filter color increases contrast and improves depth perception in low light, offering superb light management properties. Gray filter color minimizes color distortion in bright conditions, making it ideal for water sports. Yellow filter color provides excellent depth perception and contrast in low light. The Copper filter is a general purpose tint that heightens visual acuity and enhances color. Copper is effective in filtering scattered blue light, improving contrast and provides truer color definition than amber. It delivers the brightest field of vision and is applicable for skiing, fishing and all flat light conditions. Frames carry a lifetime warranty.