I have struggled with creating curly hair styles for the doll's for years.. I tried everything under the sun to get yarn to curl permanently, but nothing seemed to work long term.. At one point, I was using a stiffening product intended for ribbon and then rolling a few strands at a time with perm rods.. This process was very, very time consuming and MESSY... It required the doll to sit in front of a fan for days so that all the yarn could dry... But worse than that, the curls didn't stay...