Available only on select spherical lenses, True Sight™ is a partnership between Giro and Carl Zeiss Vision to create premium performance optics. The tapered, spherical design creates a distortion free window for you eyes, and maximizes interior space to help prevent fogging. The result is a premium lens with amazing clarity and field of vision. All True Sight™ lenses are manufactured and tested by Carl Zeiss Vision in their overseas facilities to ensure they meet the highest of quality standards.