Made of Grilamid TR-90, a homopolyamide nylon characterized by an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage. Hydrophilic rubber ear and nose pieces for a no-slip fit. Adjustable ear pieces for a customizable, comfortable fit. Vented lenses improve air circulation, prevent fogging. - This model comes with GT & EC lenses designed specifically to help spot a ball in flight and to read surface contours and terrain breaks.