Laptop insert made of fabric?

Does anyone know how these thin pieces of cloth are called with new laptops between the keyboard and screen when you unpack it? Can buy something like this somewhere?

This is a "gentle flow" (for notebooks)

Einleger sounds right for me. Certainly there's a cool English word for it, but it still remains a cloth.

I have not seen it yet to buy. But you can easily do that yourself from a fabric remainder? For example, Cut out of an old T-shirt?

Consumer electronics (TV, console, receiver…) is sometimes such white foam-like film wrapped. You could also use that.