Gresso glasses are incredibly light and totally unbreakable. You shouldn't worry about durability anymore.
Lenses: Carl Zeiss
Weight: 18 g
The best built pair of sunglasses I have worn or seen. I have tried numerous brands of sunglasses but none have the lightweightness that these have achieved as well keeping their clarity in the lens. The solid one piece titanium frame can take a beating and I haven't put a scratch on them (as of yet) and when my youngest grandson threw them after hearing us enter the room, there wasn't a mark on them. Granted it wasn't very far since he is a toddler but I have other pairs not survive our other grandchildren. Thank you so much Gresso for a great product.