How does this puffer fit compared with a regular jacket?

It is cut relaxed and loose, so it runs roomier than a standard fit. The chest measures about 45.7 inches on XXL and about 52.8 inches on XXXXXL, with the length growing from roughly 27.6 to 29.9 inches.

Is it warm enough for deep winter?

It is built for insulation with a hood, long sleeves and ribbed cuffs and hem to hold warmth in. It is described for autumn and winter wear, but no fill power or temperature rating is given, so treat it as a cold-weather layer rather than extreme-cold gear.

No waterproof or water-resistant rating is stated. The fabric is described as warm and breathable, so it handles dry cold better than rain.

What pockets does it have?

It has multiple practical pockets. The listing does not break down their exact number or placement.

Can I wear it over a hoodie or sweater?

Yes. The loose cut and roomy chest measurements leave space for a mid-layer underneath, which is the main reason to size as listed rather than up.

How should I pick a size?

The brand says to follow its size chart, and the cut is generous. If you want a closer fit, consider the smaller of two sizes; if you plan to layer heavily, keep your usual size.