Size:73-16-135mm
Front: TR
Temples: TR/TPR
Lock: TR (Patent)-Super easy lens-change system
Nose pads: L#Silicone(Patent)-Can be adjusted vertically and horizontally
Lens: PC 8C 2.0mm
Merits: Patent structure that very easy to change lens. Generally, customers will purchase 3 pairs of lenses as a set, different lenses are suitable for different weather.