Saint Laurent SL M172 sunglasses pair a tortoiseshell acetate frame with grey nylon lenses for refined everyday sunwear. The model balances classic styling with practical lens options for prescription or non-prescription use. Key attributes: Brown | Havana | Grey | Acetate | Prescription lens compatible | Includes original case | Tortoiseshell acetate frame | Grey nylon lenses | Dimensions & fit: 53 mm (lens width) | 20 mm (bridge) | 145 mm (temple) | 37 mm (lens height) | Medium fit | Composition & care: Acetate | Nylon