They fit surprisingly well! Yes, they are kinda square, but oddly comfortable. They block a lot of noise, this was my first iem like this and it really surprised me. And they don't fall, like, ever, they fit really tightly + the cable behind the ear and that thing is not getting out. They come with 6 different types of rubber bits, so you'll probably find one that fits you. I don't know if it's uncomfortable for some people because of the weird shape, but all 3 people that I know used these had no issues, actually said they were able to use it for hours with no problem.