A tip for those having trouble with generic earbud retention or fit (discomfort). Visit a local audiologist and have them make you custom earmolds for whatever earphones you have (sometimes you have to send the earphones in with the order, so that the company that makes them (usually Westone) can do a proper fit). They will adjust them so that they fit to a T. They will stay in snuggly and securely, and remain comfortable for hours of use. And they will isolate noise better than anything else out there.
If you live near a university, get them at their clinic (same is true if you need hearing aids). You will get unprecedented care and attention, and they usually have minimal to no markup.
