Guideline Eyegear Alpine Sunglass, Clear Crystal Frame, Spring Copper (Flash Silver Mirror) Polarized Lens, Large Grilamid BTR bio based polymer frame, fully recyclable has tremendous eye coverage and sleek look with no-slip nose and temple pads High polarized protection for slopes or seas - includes Neoprene case with Velcro closure Polarized Polycarbonate Lens 100% UVA/UVB Protection Silver Flash Mirror lens appears silver and is paired with tints of copper, brown or gray depending on style; VLT 12.85% The tint and mirror combination absorbs a high degree of blue light, which boosts contrast and heightens visual acuity