Dragon’s top of the line RVX goggle has all their best technologies and innovations in a modern frame shape. They have incorporated their latest lens changing systems, the Swiftlock 2.0, which is quick, easy and secure using a discrete lever built into the side of the frame to lock the lens in place. Optical glasses can be worn underneath as the frame is OTG (Over the Glasses) compatible. Coming with two premium injected lenses with Lumalens technology, you are set whatever the conditions.Lens: Lumalens Midnight + Lumalens VioletVLT: 6% (CAT 4) + 62% (CAT 1)Size: Medium/LargeLens Shape: CylindricalMain LensLUMALENS Midnight – With a 6% VLT, one of the lowest available, this lens is suited for the brightest of days, great in typical spring conditions and high altitude. The lens has a hydrophobic hard coating to repel water and give added protection.Bonus LensLUMALENS Violet – With a 62% 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.