Is this a perfume or a moisturizer?

It is a body mist: a light fragrance with glycerin and red algae for softness. It hydrates lightly but does not replace a lotion or a concentrated perfume.

How long does the scent last?

Most buyers describe a few hours of wear. Expect to reapply if you want the scent to carry through a full day.

Can I use it on sensitive skin?

The formula is described as gentle enough for every inch of skin, and reviewers with sensitive skin report no irritation. Patch-test first if you react easily to fragrance.

Can I layer it with a perfume?

Yes. Its light scent works well as a base under a matching or stronger fragrance, or on its own in warm weather.

Does it contain alcohol?

The listed key ingredients are glycerin and red algae; the full ingredient list is not given here, so check the bottle if you avoid alcohol or specific fragrance compounds.