Review (3/5): nice soft curlers, but hair slides out.
I was looking for simple curlers soft enough to sleep on, and these seemed like a good option. I remember using a similar type decades ago as a teen. They arrived in good time, well packaged. I tried a few of hem on my 4" long hair, but struggled because the hair kept slipping out at two points. 1. just wrapping the hair around the curler was a bit of a struggle as the curlers are so smooth that there was nothing to grip the hair, and 2. When I would flip over the top of the curler to close it, simultaneously rotating it such that the flat bottom was against my head, the curlers fell off half the time or more.
I have been using the hook-and-loop velcro-like curlers, which work great, but are not sleep-friendly. A hair-dressing friend suggested using wrapping papers around my hair when using these smooth silicone curlers, so I might get and try the papers. For now, just three stars because of how slippery they are, but I will revise if my opinion changes after trying wrapping papers.