The X1s offers the style and premium performance that Dragon has become renowned for. Their patented Frameless Design allows for a large field of view so you can see more, and a twin-lens package covers you for all conditions you are likely to encounter on the hill.Lens: Lumalens Purple Ionized + Lumalens Light RoseVLT: 23% (CAT 2) + 66% (CAT 1)Size: MediumLens Shape: SphericalMain LensLUMALENS Purple Ionized – With a 23% VLT this lens is best suited for bright, sunny conditions through to overcast. 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 Light Rose – With a 66% VLT this lens is at its optimum in snowy, heavily overcast, and darker 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.