Keyhole nose design and angled lenses, Slate has a strong lifestyle character but don't let it fool you - Thermogrip rubber inserts on nose pads and temple tips keep fit right, 8-base wrap for better coverage, and great optics make Slate your best friend whether in action or just hanging out. Details: Lifestyle family, medium fit, PC Brown Emerald, 8 base, 58/45/19/130, B-20.3 polycarbonate lenses. Polycarbonate Lenses - made from premium grade resin, resulting in a lens that is 20 times more impact resistant than glass and three times lighter, with unrivaled precision and clarity. Polarized Lenses - have a built-on filter that allows only vertically oriented light to pass through the lens, blocking horizontal oriented light, glare is all but eliminated. Oleo/Hydrophobic Treatment - forget about dirt, grease and water drops, outer coating makes it nearly impossible for foreign bodies to latch on to your lenses. Anti-Reflective Treatment - scientifically engineered coating is applied to the inside polarized Bolle lenses. B-88 Nylon Frame: Only the finest grade nylon, resulting in frames that are exceedingly strong, yet lightweight and flexible. Material: Polycarbonate, Thermogrip Rubber, B-88 Nylon. Bolle delivers the highest quality sunglasses and goggles for performance and protection, constantly refining trademark combination of fit, fashion, and comfort, resulting in some of the freshest and most technologically advanced eyewear in the industry.