Sports Polarized Photochromic Sunglasses for Cycling Mtb Ski Fishing Watersports Golf Running and Outdoor Activities - P1000FT Windproof Wraparound Glasses by Bertoni Italy; manufactured in TPX-lightest polymer frame, material's density 0.83gr., innovating in frames' material results in flexibility , lightweight and floating abilty. The material is totally unsinkeable due to his lightness. Sporting people will be captivated by the characteristics of this PHOTOCROMIC Polarized which darken and lighten automatically depending on the UV light exposure.Lens: photochromic polarized from light smoke filter 2 to grey filter 3 - it adjusts to the brightness - Polarized lenses: reduce reflections of horizontal surfaces. This lens combines both polarizing and photochromatic features These technical and professional sporting sunglasses includes an adjustable and removable elastic strap to have a very skin tight fitting for who practices extreme sports. Aslo the special cuts on the upper surface prevent the foggin up. Bertoni provides lifetime after sale service for all Bertoni goggles and sunglasses.