Is this jacket waterproof?

No. It is described as windproof with a thermal lining. There is no waterproof or water-resistant claim, so it handles dry cold and wind better than rain or wet snow.

It has an insulated thermal lining and a windproof shell, which together hold body heat in cold wind. No fill weight or temperature rating is given, so treat it as a cold-weather layer rather than extreme-arctic gear.

It is cut as a loose fit, so it runs roomy by design. That leaves space for a sweater or hoodie underneath. If you want a closer fit, consider going down.

Can I layer a hoodie under it?

Yes. The loose fit is made for layering, and the full-length zipper lets you open it up when you warm up.

What is the hood like?

It is an attached hood with a drawstring, so you can cinch it against wind. It is not described as detachable or helmet-compatible.

Is it good for active use like hiking?

It is fine for walking and outdoor work in the cold. It has no stated breathability or waterproofing, so it is less suited to hard sweating or wet weather than a technical shell.