Is this jacket warm enough for below-freezing weather?

It is built as a cold-weather puffer, so it is meant for winter temperatures and layering over a sweater. For deep cold or long exposure, add a base layer and a windproof shell.

Can I wear it in rain or snow?

It is a puffer, not a waterproof shell. Light snow and dry cold are fine, but for steady rain wear a water-resistant shell over it.

Does it pack down for travel?

Puffers of this type compress but do not pack as small as lightweight down jackets. It is better suited to wearing than to stuffing in a daypack.

What should I wear under it?

A base layer plus a midweight sweater or hoodie covers most winter days. Size up if you plan to layer thick knits underneath.

How does it compare with a down jacket?

It offers comparable warmth with a more structured, everyday look, but it is heavier and bulkier than ultralight down. Choose down for packability, this for daily winter wear.