The X1 has true Dragon style and stands out with its patented Frameless Design and large spherical lens. The twin-lens package covers you for all conditions you are likely to encounter on the hill.Lens: Lumalens Green Ionized + Lumalens AmberVLT: 23% (CAT 2) + 54% (CAT 1)Size: Medium/LargeLens Shape: SphericalMain LensLUMALeNS Green Ionized – With a 23% VLT this lens is best suited for variable conditions, from overcast to sun. The lens has a hydrophobic hard coating to repel water and give added protection. An Ionized finish is used which makes colours richer whilst reducing glare.Bonus LensLUMALeNS Amber – With a 54% VLT this lens is at its optimum in snowy and overcast conditions. The lens has a hydrophobic hard coating to repel water and give added protection.Visual Light Transmission (VLT) refers to the amount of light that penetrates a lens. A low percentage means less light passes through and a higher percentage lets an increased amount of light through. A lens with a lower VLT rating is better for bright conditions, where as one with a higher VLT is more suited for overcast and snowy days.