You should probably not put them in your ears either if you want them to sound their best. After all, ear sweat would be trapped and then when it heats up and evaporates it could condense on the metal inside the IEM and corrode the surface. That cant be good for them. You probably need special in-ear anti-perspiratant just to be safe. Of course, this having been my personal specialty, I have the applicators (Cough - Qtip - Cough) and magic dust (Cough - Gold bond) all for the low low price of $49.95. Or you can sign up for our subscription service and get a new kit every month for only $19.95 a month (Billed a decade in advance of course).