If you look on websites devoted to that sort of thing, people endlessly slag off the white earphones you get as standard issue from Apple. I love them. They fit in my ears perfectly; they stay snugly in while I am running without blocking off sound dangerously; and so on and so forth.
But the stupid buts of rubber around the speaker-mesh shreds and falls apart in about six months. It's maddening. I wear almost no other thing out on earth except for these. It is a major calamity in anyone's book.