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Looking at the pictures in the scientific article it doesn't look particularly weird, just a white cloth: https://science.sciencemag.org/content/early/2021/07/07/scie...

You link to what I assumed to be a picture, got a paywall instead.

Sorry, being under the IP address of a university removes a lot of paywalls :)

thanks!

Cool. I wonder if you could turn it inside out, such that it dumps heat inwards to have the opposite effect and warm you?

It probably reflects sunlight, not heat. So unless you shine very brightly it won't work in reverse :)