I am sure that there is a far more correct, technical, term for these - but I know not what it be.
For a very long time, these were my go to from my arsenal. I was given a mixed bag of hair bits by Margaret last year, which contained about 6 of the blue rollers above. They were too big for my shorter locks in the New Year, but I loved the fact that they allowed air to travel to the core of the hair.
So I went on a search. An eBay search.
I found them here on line relatively cheaply, but have since seen them in various independent pharmacies. They are often called "soft rollers" or "bedtime rollers"- which makes me think of sponge rollers - and I have to say, they may be made of firm-ish plastic, but they are very comfy to sleep in.
I start by sectioning off the top of my hair with the aid of a rat-tailed comb and then set to rolling.
I use setting lotion with these, although I am sure that all other agents would work just as well. Mousse is a good one for me if I am out of lotion. I apply from a spray bottle and always neat. Water and my hair produces only frizz, so I never dilute.
Now, I have been using these for a while now, and there is a trick to getting them in, and out, of your locks.
Once my hair is damp, I wrap it around the roller, making sure I have the ends all in. The little spikey bits on this work really well for this.
I then take hold of the bobble in one hand and make sure that I have a firm grip on it and the elastic. As I roll, the elastic does become twisted - but it is in my hand and not attached to a stray piece of hair and making me wince.
Once the hair is all wrapped around, I then let go, the elastic un-twists and I can stretch it over and pop the bobble in the end with no wincing. Win.
For these, I usually roll the top section under and the rest of the hair up.
As with putting them in, there can be issues with that pesky elastic when taking them out. When I first started to use these - they became entangled on more than one occasion. But I was so impressed with the longevity of the curl, that I kept working with them until I had mastered it.
The trick is to pop the bobble out of the end and then let go. I have had terrible trouble with the curler itself becoming caught and those wondrous grippy teeth, that so helped me when putting them in, turning against me. Tease, don't pull these out, and you should have minimal issues.
I find these great to sleep in, because they are small and therefore closer to the head than sponge rollers ever could be.
I have seen these for sale in the XS size (pink) and slightly larger (yellow). They are washable, and repairable. I like this muchous. If the elastic breaks, I can fix it instead of chucking it in the bin.
Ease of Use: 6/10
Comfort when Sleeping: 7/10
Longevity of Curl: 8/10