Tortoise Vogel 2.0 single lens mode. Frame-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 and nose pieces for a customizable, comfortable fit. Lens-comes with a brown gradient lens-a brown lens enhances color contrast, ideal for hiking and mountain biking to view the trail ahead.