Cocoons® is the leading brand of optical quality sunglasses that are designed to be worn over prescription eyeglasses. Cocoons'® selection of OveRX® (over prescription) products include clip-ons, sunglasses, and low-vision absorptive filters. Cocoons® is dedicated to providing innovative sunwear solutions for individuals who need to wear corrective eyeglasses but also want the protection and convenience of sunglasses. Each Cocoons® product features optical grade, scratch resistant lenses and custom accessories. In fact, Cocoons® is so confident in its products that it offers a limited life time warranty. Cocoons® offers a wide array of color and design options as well as 360° of UV protection® from its Polaré® polarized lenses; Low Vision frame styles are not polarized.Cocoons Slim Line (Medium) is a Full Rim, Fit-Over frame for Men and Women, which is made of Nylon.Nylon is a thermoplastic material that is blended in order to counteract its initial brittleness. Nylon blends are lightweight, stable, and resistant to breakage. Nylon has less of a tendency to "bleed" it's plasticizers resulting in great hypoallergenic properties. It can be blended with polyamides,grilamid, or trogamid. This model features a Oval/Rounded Edges shape.The Cocoons Slim Line (Medium) Sunglasses feature the following logo: The Cocoons label is displayed on the temple These Sunglasses work well for people whose style is: Classic.Ideal for usage with: Driving.Cocoons Slim Line (Medium) Sunglasses come with a cleaning cloth and protective carrying case.Fits over prescription frames measuring less than 133 mm in width by 39 mm in height 5 1/4 inches in width by 1 1/2 inches in heightThese sunglasses are available with a mirror coating option on certain colors. Mirror coatings are suitable for protection from intense light. A mirror coating reflects back light and reduces the amount of light passing through the lens. This makes it more comfortable for eyes in very sunny conditions.These sunglasses are available with polarized lenses on certain colors. Polarized lenses have a filter within the lens that blocks the wavelengths of light that cause glare. They can greatly enhance contrast and allow for greater depth of vision, especially in water. They are ideal for any situation where glare reduction is necessary, like driving or playing sports.