Martini M39 sunglasses Feature Martini's New 8 Layer "Ultra Polarized" Glass Lenses with "Hardshell" proprietary scratch resistant coatings, "AR" anti reflective treatment to reduce rear and side glare and an Oleophobic coating which includes a Hydrophobic treatment that seals the lens surface and reduces the adhesion of grease and water. This makes a lens very easy to clean. These lenses are the Best in the World! The M39 features a Handmade Acetate frame fitted with Optical spring hinges.