I returned because I didn?t want to go thru the hassle of a exchange. Adjustable Velcro band so I can fit it perfectly to my head. We took em to the beach and the both of them together were just not loud enough and even beach waves muffled the music. They broke. Extreme comfort and the ability to walk about with almost no pain and discomfort. Thank you Kamenstein. Great cheap option to bring back my old batwolfs. If anything, removing the rumble only serves to unmask the sound of stray conversation, so make sure you have a good music collection that you can sleep through. I continue to be impressed with the rim sports brand of exercise accessories. Unfortunately its also because of this great feature, it creates a minor delay to activate the action, after your touch.