Martini M13 sunglasses Feature Martini's New 8 Layer "Ultra Polarized" 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 M13 features a Handmade frame fitted with Italian Optical Dual Spring hinges. These are the exact same hinges used by Maui Jim and Persol. Size 64-13-135. Very similar look and feel as the Maui Jim 106 Hoku.