The old school stocking caps were that gapped nylon just like panty hose and heck yeah they ripped your edges and broke hair. these seem to be fine. the fabric feels satiny. my edges are still here. bonnets and scarves rip my edges clean off.
I do have some excellent satin pillow cases from a woman on easy. Every other "satin" I have tried has had pilling within a few washes. I have washed and dried her satin countless times ( I have satin baby sheets so those need washing frequently) and they are still perfect. I just like the caps to protect my skin from the oils. I wrote one of the ladies in that make the hats in the links provided above by the members who initially answered this and one lady said:
"Ok so the bonnets you get from the beauty supply stores, Walmart etc aren't real satin. It says satin but it's really nylon material.
The bonnets on my website are made on high quality chanteuse satin. I do not use silk bc it is very thin and not as durable as satin and doesn't hold up well after washing it.
All bonnets on the website come with both elastic and a drawstring. The elastic and drawstring is encased and covered with satin so I'd does not touch your edges."
I will definitely be getting some of those caps you menaintoned to wear under my wigs! Thank you!