Retina Big Clarity Comp comes with competition specific gradients and are made of optical-quality PC/CP from Carl Zeiss that are anti-scratch and anti-fog treated for better vision and scratch resistance. The PU frame adapts to different face shapes. It retains its flexibility even when it is cold, and the triple foam and fleece ensures a comfortable fit. It fits all Retina Big lenses. An extra lens for low light conditions is included.