As its name suggests, the Julbo Wave is designed for playing hard on the water, whether you're kayaking, stand up paddleboarding, or surfing. . Octopus polarized photochromic lenses darken or lighten depending on light intensity VLT changes from 20% to 5% VLT Visible Light Transmission: percentage of available light allowed to reach the eye the lower the number, the darker the lens. NTS technology allows the lens to change regardless of temperature. Water repellent lens coating makes water slide off of the lens and prevents hydrogen bonds from forming between water molecules for improved visibility. Polarization eliminates glare to ensure purity of vision. Category 2 protection in the undergrowth category 4 protection in bright sunlight. 100% protection from UVABC rays. Removable protective frame skirt conforms to the contours of your face to prevent water spray getting in your eyes. Frames will float if dropped in the water also includes a neoprene floating safety cord for optimum comfort and hold. Total cover shape provides maximum protection against harsh sunlight in extreme conditions. Curved temples provide an ergonomic profile grip tech inserts on the stems offer comfort and hold. Recommended for use on the water and in bright sun conditions not recommended for driving. Fit eye, bridge, temple: 67, 19, 130 mm.