Guideline Eyegear Kingfisher Sunglass, Tortoise Frame, Spring Copper (Flash Silver Mirror) Polarized Lens, Large/X-Large Grilamid BTR bio based polymer, fully recyclable thick performance frame and large lenses with wide internally hinged temples Protects against sun, wind rain and spray with ample overall surface area - 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