In winter in Beijing, it is cold when the wind is strong outside, and there is heating indoors, so there is no need for a coat. There is no wind outside, and it is not very cold.

Outdoor coats mainly emphasize waterproof and breathable, so when it is windy, cold air will still come in.

Down jackets keep warm, but if they are not windproof, the wind can still get in.

It is recommended to wear a windbreaker, which is used to keep out the wind (not as warm as a down jacket), but it is worn outdoors.