Comfortable! I react to everything -even these burned after I washed them and sterilized them however. Here's a tip. Before putting your posts in dip them in Neosporin. After I do this I can leave them in for days. Be careful because it's a bit greasy & the backs want to slip out of your fingers. I swear by  this technique, With very sensitive ears it really  makes all the difference in whether you are comfortable or not.