I bought a pair of the modern aviators made of the same cheap nylon plastic material and cost-cutting hinge-free feature means glasses get memory and lose form after a few weeks of use. Aviators broke after continued folding of plastic to fit in sunglasses case I had leftover from another pair. These look thicker than the aviators, but I would avoid these glasses made of the nylon material because it will likely fail after a few weeks. Extremely annoyed at paying such a high price for a cheap product. Lesson learned.