These are lightweight sunglasses from Seiko's eye care brand, Melanieena. They are in beautiful condition with no signs of use. The thin lenses make them useful even for winter. The size is unisex, and they are lightweight, so they are comfortable to wear. From the website: "The lifespan of our eyes is said to be about 70 years, and over 80% of people in their 70s suffer from diseases that can lead to blindness if left untreated, such as cataracts and age-related macular degeneration. After the age of 50, the melanin pigment that blocks ultraviolet and blue light, which are harmful to the eyes, decreases, so you should get into the habit of protecting your eyes with light-colored sunglasses" (Dr. Fukasaku). This product uses lenses containing "artificial melanin" developed by the Italian sunglasses specialist, Intercast S.p.A. (founded in 1975). Although there are many light-colored sunglasses, lenses with artificial melanin are rare. Thanks to these lenses, ● 99.9% cut of ultraviolet rays, which are a cause of cataracts ● 42.1% cut of blue light, which is a cause of age-related macular degeneration Since melanin is a pigment that is originally present in the eyes, the field of vision is also natural. It also transmits 82.4% of visible light, so the field of vision does not become dark. Steps and road level differences can be seen clearly. The light weight, which does not put a burden on the eyes even when worn for long periods of time, is also one of the popular features. Made by Seiko Optical Products (founded in 1921). Lens features: Blue light cut Lens features: Color lenses, blue light cut