Do these actually block UV?

The lenses are rated UV400, which covers the full UVA and UVB range up to 400 nm. That is the same rating claim premium sunglasses make, though it rests on the maker's labeling rather than a third-party test.

Are the lenses polarized?

No. UV400 protection and polarization are different things; these block UV but do not cut glare reflected off water, snow or asphalt. If glare is your main problem, look for a pair labeled polarized.

What do they come with?

They are sold as sunglasses only. There is no mention of a case, pouch or cleaning cloth, so plan on storing them in something soft to avoid scratches.

Are they good enough for driving?

They cut brightness and UV, which helps on sunny days, but without polarization they won't remove dashboard or road glare. Many drivers prefer polarized lenses for that reason.

Can I use them for sports?

They are a fashion frame, not a sport shield. They lack wrap coverage, grippy temples and impact-rated lenses, so they are a poor fit for running, cycling or ball sports.