I have medium length fine hair but a lot of it! And they work perfect for me. My hair doesn’t get tangled in them, I don’t end up with knots like I do with regular hair ties and I don’t get the annoying sort of pain that sometimes get from normal hair ties. They also don’t leave creases in my hair, even when I put my hair up in a messy bun. Maybe it is because I have medium hair length? I also just got my hair cut so no more dead ends which can make hair harder to deal with. My only complaint is that they get scratched out but if I leave them sitting on the counter overnight they go back to their usual size. I am sure over time I will do what is suggested in the video to fix the stretching.