Introducing premium quality TR90 optical frames by Velocity. TR90, a thermoplastic polyamide. is often referred to as plastic titanium or memory plastic. TR 90 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, 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.