About the frames, we have one material TR90. TR90 is a thermoplastic material that is incredibly durable, flexible, and lightweight. This frame is made with TR90 are extremely comfortable. Since they are that much flexible, they can bend under pressure and contour your face comfortably. Because of the TR90 frame's flexibility, it also makes them resilient to damage.
TR90 frame are lighter and more flexible than plastic frames. They are all very good quality.
About the sunglasses lenses, gray lenses are polarizing lenses, yellow lenses are night vision lenses, and others are ordinary lenses.