I know it’s not polite to talk about… but some people are sweaters. You might be one of the unlucky souls that can break a sweat under your arms in even the iciest of temperatures… which is not only unflattering… it limits you on what you can wear.
Here is a tip....
Put deodorant on at night, too. That way, it will have plenty of time to absorb into your skin and start working... In the morning, shower and swipe on another coat as you normally would.
Your pits should be good to go.