So- this is a lightweight (cotton?) knit sleeping cap on the outside with a silk liner.I have fine hair and wanted protection from my CPAP machine since the straps wreck havoc on my hair. However my CPAP straps seemed to be the only things keeping the cap on my head, as it slides off up to the straps by the time I wake up.Although this cap has an adjustable elastic band built in, it doesn’t stay on well with natural sleep movement.When it does stay on (somewhat), it makes my head sweat more than usual at night, which might make me toss and turn more. The jury’s still out on that.Anyway, with it mostly on all night, when I get up, my hair is flattened and droopy.However, the cap does air-dry nicely (I just invert it over a bottle on my dresser). Also, when it stays on, my hair does feel softer and sheds less— and is protected from my CPAP straps. The silk liner works.Aesthetic-wise, the cap doesn’t look like an old-time night cap from days gone by like the storybook imagery of ‘Twas the Night Before Christmas’.However, maybe those people knew what they were doing…?! Maybe their old style stayed on better?So my conclusion is that this cap would be good to wear if you tend to get cold at night and could use the additional heat. It’s nice for your hair if you can find a way to keep it on at night and if your head tends to sweat at night, this hat will probably make it worse. So hopefully, you won’t mind blowing your hair out in the morning, (which resulting heat damage might defeat the gains made from wearing it in the first place?)I think people with “big hair” might just find this cap to be a dream— as I’m guessing it would probably stay on their hair better.But for people with fine, straight hair like me, there are probably designs that would work better even if they do look more old fashioned…?I don’t know for sure as this was my first time with a hair cap at night.So- yes, this seems to protect your hair when it stays on, if you can get used to it. Perhaps I need to keep trying so I get more used to it?But maybe just using a silk pillowcase and silk scrunchies would be more comfortable…? So far, I think so.So yes— this cap does what they claim and the real silk does wonderful things for your hair. However, the outer knit layer might make it too heavy to stay on fine, straight hair, and too hot for (post menopausal) people who already run a little hot at night.