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I use one of these, it's nice and warm and covers your mouth and ears. The main downside is that it's not very good at covering your nose, but that might just be my weird shaped face. You can buy it from Workman there are branches all over Japan. They have some pretty good base layers too.
I use a Buff™. Actually I have several, in different colours to match my mood. There are lots of different ways to put them on, depending on how much coverage and ventilation you want at the time.
https://www.buffwear.com/buff-adult-headwear
Available from Amazon, Rakuten, L-Breath, etc. etc.