I had some custom ones made to fit. they put silicone or similar, in your ears and make a mold from that. they had a detachable string so you can take them out and put them back. I found they bugged me. the string had the effect of a pop can on a string so every time I turned my head it would rub on the string and make a weird noise, drove me nuts. some like them.. it was an option to have the string embedded or removable.
at home and around your shop or whatever you do, you can wear headphones and have music, just not in an industrial environment. I find the little foam ones more comfortable. if those hit the floor they are done. if you get the pre-molded ones you can wash them.