Saint Laurent SL 851 Sunglasses pair a squared acetate frame with NXT photochromic lenses that transition to grey and filter blue light, offering a refined option for daily sun protection. Key attributes: Black | Photochromic Grey | Acetate | Photochromic lenses | Blue-light filtering | Photochromic transition lenses | Includes protective case and cleaning cloth | Squared frame | Full rim | Iconic corner angle | Saint Laurent logo engraved on temples | Dimensions & fit: Eye: 56 mm | Bridge: 17 mm | Temple: 145 mm | Composition & care: Acetate | Nylon (lenses)