Dirty Dog Sonic Sunglasses - Satin Blue | Grey PolarisedMoulded from Grilamide TR90, a thermoplastic polyamide. Dirty Dog frames are lightweight, extremely flexible yet super strong with 100% memory allowing the frames to bounce back to their original shape. Put through the harshest testing conditions, Dirty Dog has proven TR90 will keep its properties in extreme temperature including low and high temperatures, as well as extremely humid or dry conditions. This makes them the perfect choice for any situation and gives the wearer a guarantee that they will stand up to the job. TR90 has demonstrated no risk of allergy and is FDA and CE approved.Equipped with the latest lens technology in POLARISED POLYFILTER lenses. Scientifically formulated to offer exceptional defence against the suns harmful rays, our POLARISED lenses absorb radiation that can be damaging to the human eye. These lenses provide clear and restful vision in the most extreme environmental conditions offering optimum glare and UV protection. Dirty Dog Polarised lenses block reflected horizontal glare making them the perfect choice for any high glare situations like fishing, boating, skiing, driving or any situation where you need extra protection from reflected glare.