Lanvin SLN500 0T40 Sunglasses. Take on the American style with Brown Marble Sunglasses Brown Gradient Lens by wearing authentic Lanvin SLN500 0T40 Sunglasses. Lanvin SLN500 0T40 is a discreet, elegant accessory that authenticates your distinctive personality. These Lanvin Brown Marble Sunglasses Brown Gradient Lens will protect your eyes and still feel comfortable and very chic .