Premium frame design & materials: the sunglasses have composite engineering resin frame, 5 sets of high standard pc lenses, 100% uv400 protection coating. The frame is light, flexible, sturdy, anti slip, comfortable and good covering round face. The bike glasses lenses are lightweight, clarity, anti-fogging, waterproof, shatterproof, anti-glare, anti-uv, explosion-proof and impact resistant. Well made and good quality...