Is the RB3721 good for round faces?

Yes. The rectangular shape adds angles and width to a rounder face, which is the usual reason people pick it. Oval faces also suit it well; very square faces may find it too similar in shape.

Are the lenses polarised?

The standard RB3721 comes with gray lenses and UV protection, not polarisation. If you want glare cut from water or the road, look for a polarised version or a different model.

How does it compare with the Ray-Ban Wayfarer?

The Wayfarer is a thicker acetate frame with a bolder, retro look. The RB3721 is slimmer metal and more understated, and it weighs less on the face. Pick the Wayfarer for presence, the RB3721 for a lighter feel.

Is it comfortable for all-day wear?

The metal frame is light, so most people find it easy for long wear. Thin temples can press behind the ears after hours, and the fit depends on head width, so try them on if you can.

Does it come with a case?

Ray-Ban typically ships its sunglasses with a case and cleaning cloth. Check the box contents for the specific listing, since bundles vary.

Is it good for driving?

Gray lenses keep colors natural and cut overall brightness, which works well in daylight driving. They are not polarised, so they won't remove dashboard or wet-road glare as effectively.