Definitely works. I have heat damage from my curling iron so I wanted to give my hair a break from the heat styling. These definitely curled my hair. I highly recommend getting some.
I did not leave them in overnight because I couldn’t get comfortable trying to fall asleep with them in my hair. I am a side sleeper and toss and turn when I sleep.
But I wore them in my hair for about an hour while I watched tv, etc. The curl lasted a few days in Florida humidity. Most people will probably need to buy more than one box….I had to buy 2 boxes. I needed 2 sets, because I have long thick layered hair.