1. 6 layers coatings, self-repair light damage (less than 20um), adsorb 99% UV light, protect polarized layer and absorb glare
2. Z shaped leg, suitable for different face widths
3. Clamping force is as low as 0.25N, several times less than usual sunglasses, comfortable to wear
4. Flatter curved lens, reduce discomfort and dizziness
