Costa Del MarMen's Tico Rectangular Sunglasses, Matte Grey/Blue Mirrored Polarized-580g, 60 mm

are these truly 580G lenses. I already ordered a pairfrom another vendor and he lens was only etched with 580?

Are these real costa

Are these polarized

Are these lenses good for freshwater inshore, offshore and driving and would it be good for over cast days