Is this jacket warm enough for winter?

It is an insulated puffer, so it holds warmth well for cold days. It has no hood and a round neckline, so pair it with a scarf or a hooded layer in wind or rain.

No. The jacket has a round neckline and long sleeves, so the head and neck are not covered.

It is a women's puffer with a zip front and quilted body. Puffers are cut to leave room for a sweater underneath; check the size options shown for the fit you want.

No waterproof or windproof claims are made for it. Treat it as a warm everyday layer, not a rain shell.

What can I wear under it?

A hoodie, sweater or long-sleeve tee works well. The round neckline shows what you wear underneath, so a collared or high-neck top looks intentional.

Is it good for sports or hiking?

It is a casual insulated puffer, not technical outerwear. It works for walks and light outdoor use but lacks a hood and weatherproofing for serious conditions.