True Sight™ is available only on spherical goggle lenses and marks a partnership between Carl Zeiss and Giro dedicated to producing high quality optics. Spherical lens are tapered to minimize distortion and their increased interior space fights goggle fogging. These qualities made them the perfect lens to be paired with True Sight™. The overseas division of Carl Zeiss Vision manufactures and tests all of these lenses, to ensure they meet the highest quality standards.