I have very fine hair, but a LOT of it. I recently cut my hair short so I ordered the medium sized clip, and love the look / functionality of it. However, it definitely has a hard time holding ALL my hair, so if you have thick hair or a lot of hair like me, I would say size up to the larger clip if you want it to hold all your hair up! Otherwise, for half up/half down or other styles, this clips is gorgeous and great!