Our Phat Kat unisex sunglasses feature a medium retro wayfarer style with a TR90 frame and TAC polarized lenses. Your order arrives packaged in a microfiber pouch which doubles as a cleaning cloth. TR90 is a super-polymer compound that is extremely lightweight, incredibly sturdy, but very flexible. TAC is the acronym for Tri Acetate Cellulose used in lens construction. These lenses are comprised of a scratch resistant plastic and block 99% of all UV rays up to 400 nanometers. Frame Color:  Light Brown Tortoise Lens Color:  Amber Amber lenses brighten vision on cloudy days and in low light situations by blocking blue light and reducing glare. Amber lenses also increase contrast and visual acuity, which is most effective against green and blue backgrounds. They are a good choice for fishing in brackish waters, golfing, cycling, driving, and water sports.