text: why do i sweat when wearing foundation?   you sweat all the time, it's just noticeable when you have foundation on is one half.  the other half is that you actually get warmer, because the foundation is a little bit of a "blanket"  the solution might be to let your other parts of your body cool you more efficiently so, fewer layers, clothing that can breathe, no head covering, short sleaves... keep shedding stuff (or stay in air conditioning) till you are cool enough that your body doesn't want to sweat.