Recently, friends from Russia brought thermal underwear from this company as a gift. The gift was for a little one, and the set was called "for every day." The size fit perfectly. It's currently -1°C, but it feels like -10°C! And the little one is happy, running around and not freezing at all.
Overall, the thermal underwear came in very handy for our climate.
I think I will ask them to bring some for myself and my husband too!