The NFXs offers all the necessary tech needed for you to enjoy your time in the mountains at an incredible price. The goggle comes with two interchangeable lenses so you can switch out for different weather conditions. To keep the price down Dragon uses a thermal-formed cylindrical lens but still incorporating their state of the art Lumalens technology, helping you to see more clearly with better depth-perception.Lens: Lumalens Dark Smoke + Lumalens RoseVLT: 23% (CAT 2) + 32% (CAT 2)Size: MediumLens Shape: CylindricalMain LensLUMALENS Dark Smoke – With a 23% VLT this lens is suited to very bright light, sunny conditions. The lens has a hydrophobic hard coating to repel water and give added protection.Bonus LensLUMALENS Rose – With a 32% VLT this lens is suited for overcast, cloudy 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.