Gresso glasses are incredibly light and totally unbreakable. You shouldn't worry about durability anymore.
Frame: Stainless Steel
Lenses: Carl Zeiss
The only ones I look good in. The only ones I look for whenever I go out - consistently - time and again has not failed to impress. Gresso stands by their return policy (fast and easy)- I was bummed that I had to go a few days without them, but was looking forward to opening the box like a giddy kid on Xmas!