I ordered these glasses as a gift for my brother-in-law and when I first received them I posted a slightly negative comment about how they looked like cheap plastic. My fault for not understanding what these glasses were sooner.
They are very light weight and since I was not using them myself I think I was reacting to the overall packaging as they arrived in a brown box loosely packed in a loose plastic sleeve and some plastic Amazon air cushions so it wasn't the best presentation.

The seller responded quickly and wanted to know if I could take a second look and when I did I could see where I was over-reacting. Other reviewers have posted that they have since flexed their glasses in half and they still did not break. Since this is for someone else I didn't want to put my pair to the test so I might just buy another pair to test out later on.

I would give the product 4 stars for packaging and presentation against the light feeling of the glasses but am giving it 5 stars because customer service and seller pride is extremely important and these guys seem to really care about what they are selling.

Only note might be to find a way to better present the glasses to future customers - include a small one sheet talking about the plastic or showing how flexible the glasses are? Or putting them in a nice case or box. I'm not for too much packaging but the light weight frames + the sparse packing can easily mislead people into thinking less of the product without at least some supporting documentation.

Since this one was a gift I ended up buying a matching orange case through Amazon for a separate charge.

I also printed out my own one-sheet with the image of the glasses and some of the product info so my brother-in-law would know a little more about it.