The lock slides. The hair slips. The only way I got the hair into a style was by putting it on a pre made head piece. What is the point of having the lock ties on the hair if the hair slides through anyway. Even if you double knot the hair. I do crochet styles often and this hair is just unmanageable! I'm sorely disappointed in the quality of this brand and am sad I spent as much money as I did to get it.