Hurry Sennheiser. Why all this hassle for one of the most expensive on the market! Not worth my time to send back. So without the caps, Im not sure they would stay up. Its not an issue for me but it will be for some. Playing with the different size/material earbud covers helped. He loves these and they are durable and work fantasticly. Ich konnte die 4. They are easy to put on look great and feel wonderful. I am usually at UK 5 and these fit perfectly.