The lens use strengthen thicken lens, effective UV protection, radiation protection enjoy beautiful feast of ultra clear visual. The hinge selection of quality combo kit. Effective preventing the screws off ensures smooth opening and closing of the temple. The nose pads use silicone design, not oppress nose bridge, makes you more stable and more comfortable to wear. The legs outstanding anti-slip performance. The radian is quite match ergonomics more comfortable and natural, light weight, carefully crafted with quality good gloss and not harmful to skin.