These are so much easier to perm your hair than the plastic clip on ones, you could put hair up in these rollers, then take shower at night. By the following evening, it's all curly. If roll them in not perfectly in line, then the effect is more natural. It cuts down on the prep time so much. They're durable, reusable, and easy to clean. These heatless hair curlers are safe to wear during sleep, and will help you achieve the curls that you desire with no heat damage to your hair. Effortlessly create pretty curls at home with wet or dry hair. You can sleep or go about your daily tasks while wearing them.