Do these sunglasses block UV?

Yes. The listing states UV protection, which is the standard for sunglasses sold in the US. It does not specify a UV400 rating, so ask the seller if you need that confirmed.

What face shapes suit a rectangular frame?

Rectangles tend to balance round and oval faces by adding angles. On very square or angular faces the effect can be harsh, so try them on if you can.

What is the frame made of?

The frame combines plastic, metal and acetate, with the gold finish on the metal parts. Acetate holds shape well but can loosen with heat, so store them in a case.

Are these for men too?

They are listed as a women's style. The rectangular shape is fairly neutral, but the sizing and gold styling are aimed at women.

Is the SK 7023 worth it against other designer sunglasses?

It offers a gold full frame and UV protection in a jewelry-brand style. Rivals at similar money tend to be plainer acetate frames, so the choice comes down to whether you want the gold look.

What comes in the box?

The listing covers the sunglasses only. Swarovski frames usually ship with a case and cleaning cloth, but confirm with the seller if the case matters to you.