Besides cleaning the pores I dont know, but I am going to take a guess here.
For a guy that wants to cut what does he do. He takes a thermogenic pill to raise body temp.
After a workout and the muscles need repair, I would think that the body doesn't have to heat itself so maybe more energy might go into recouping the muscles. This is just a guess.
They are very calming though and I would think that is good too.