Our Adjustable ND Filter UV400 Sunglasses are designed for the modern adventurer, traveler, and style-conscious individual. UV 400 provide nearly 100% protection from harmful ultraviolet light rays, blocking wavelengths up to 400 nanometers. Drawing inspiration from photography, these sunglasses allow you to easily adjust the light intensity by twisting the front frame, offering 9 customizable levels of light. Whether you're in bright sunlight or moving into a dimly lit space, these sunglasses seamlessly adapt to your surroundings. （Note: Frame only!!!This frame is not for prescription lenses.）