I bought both the plum large silk bonnet and the long black sleeping cap. I've used both of them so far and then washed them together in the machine. They seem durable and did well in the washer and dryer, they haven't wrinkled as of their first wash. I would say the large plum bonnet is more sturdy and stayed secured on the head all night, however the thick band is a teeny bit itchy on my forehead/scalp area and behind my ears. The long black silk cap I bought has the opposite qualms: it lacks a proper band so it slipped off a few times while I moved about and when I slept, but it is extremely comfortable. Not that the bonnet isn't, it's just a little itchy for the few moments before I get used to it and sort out the irritating like baby hairs stuck under it.
All in all, really appreciative of the quality of these products. I'm planning on buying one for each night of the week for my hair and skin. The feeling of a pristinely clean pillow with no hair and hair product residue is honestly amazing-- dare I say transformative yo my comfort.