In the accessories trade, there are suppliers of special in-ear foam attachments, which can also be used for the Teufel Move BT or other Teufel in-ear headphones.
After insertion into the ear, these self-expanding foam attachments fit the ear canal smoothly and without gaps. This ensures a secure fit and good external noise isolation. Bass is also perceived as louder.
One supplier of foam attachments is the company INAIRS. The product INAIRS Air1 is recommended by the manufacturer for the MOVE BT.