RB2140 Original Wayfarer Polarized Square Sunglasses

Hey guys... i've never bought ray bans before... how do i know what size i want? what are the different mm's?

is the rayban black rb2140 54mm made in china or made in italy?

Which ones are polarized? The gloss tortoise pictures the polarized glasses and are priced higher, but the description says they are not polarized.

What is the warranty on these? We purchased them in October and they’re very loose and the arm wiggles and doesn’t tighten appropriately.