With a slightly lower profile than the Bold, the Alias offers a medium fit. The optically correct polycarbonate lenses offer superior impact protection and are ANSI Z87.1 rated. Medium to medium profile fit. Optically correct polycarbonate lenses meet. ANSI Z87.1 impact ratings. TR-90 frame construction with soft rubber temple and nose bridge. Exceeds UV-A / UV-B / UV-C