What does polarized mean here?

The lens is built to filter reflected glare, the kind that bounces off water, wet roads and car hoods. That is the main reason to pick these over plain tinted sport glasses.

Will they fit over a bike helmet?

They are a one-size wrap frame meant to sit on the face, not over a helmet. Check that the arms clear your helmet straps before you ride.

Are they good for fishing?

Polarized lenses are the standard choice for fishing because they cut surface glare so you can see below the water. These are aimed at exactly that use.

Can I wear them for driving?

Yes, they are marketed for driving and the polarization helps with dashboard and road glare. Some car displays and tinted windows can look odd through polarized lenses, so try them in your car.

What comes in the box?

The listing is for one pair of glasses. No case, cloth or spare lenses are listed, so plan to store them in a pouch or case of your own.

How do they compare with branded sport sunglasses?

They cover the core job, a lightweight wrap frame with a polarized lens. Branded rivals add interchangeable lenses, prescription options and proven lens coatings, which these do not offer.