Gresso glasses are incredibly light and totally unbreakable. You shouldn't worry about durability anymore.
Lenses: Carl Zeiss
Weight: 17 g
I am not a review writer, normally. I just had to leave one for these sunglasses. They certainly did not disppoint. The frame are so light yet I did twist them a bit to see if they would retain their shape. THEY DID! The lenses provided clairty without distortions from the brown tint I selected. The glare reduction was very noticable as I sat in rush hour traffic with the morning sun facing me. I am going to buying a second pair.