What is this?

[Cgong]

I have some rolls about 3m long of this. Can someone help me understand what it is? No labeling. Woven plastic. Thank you in advance!

 

[Tompafix]

I have a few rolls approximately 3m long with this. Can someone help me understand what it is? No markings. Woven plastic. Thanks in advance!

I have that in the ceiling of my house built in '78 as a vapor barrier for the attic,
https://www.byggmax.se/kondensväv-bison-p6303013

 

[para]

Usually also works as anti-penetration protection in floors and roofs