2*Pi*R sunglasses are perfectly round, and available in 8 color combinations. Everyone should have a couple pairs of round sunglasses in their wardrobe, for those days when your confidence, style, and intelligence must be communicated to the world. All 2*Pi*R sunglasses come with polycarbonate lenses, with backside anti-reflective coating, and 100% UV protection. Not only will you look great, but your vision through these lenses will be unsurpassed. Like all PiWear eyeglasses and sunglasses, when you buy a pair, you make a blind person see - literally.