The Projekt's unique presence begins with broad temples and medium face fit thatis perfect for any daily routine. Carbonic TLT lenses provide optical clarity inboth polarized and non-polarized options. Carbonic Lenses are the most impact resistant lens material. Not in the country, not in the industry, but in the whole world. That's Carbonic and it's only the beginning. We injection mold Tapered Lens Technology for perfect optical precision and add our new anti-scratch resistant coating to keep them fresh. Lenses are lightweight, idealfor sports and surpass ANSI Z80.3 with 100% UV/B/C. The Projekt has eight base lens curvatures to choose from with Grilamid TR90 Frames Resilient, tough and flexible. Grilamid is an exceedingly light and durable plastic that will maintain its shape under all temperature changes. If you need a prescription lens these are RX Compatible. Sunglasses come with a Lifetime Warranty.