Hat Not Felting

Hi there, I’m not sure if this is the right place for introductions, but here goes.
I have taken up knitting in the past 2yers. I am now making felted hats, however, I have a big problem.
my last 3 hats turned out to be place mats. :knitting: I followed the directions for knitting them, used hot water and agitation for shrinking them but they came out flat. Did I mix too much synthetic eyelash decorative thread?
Thanks for the help.

That’s very likely…synthetic yarn will not conform to the felting process though it may create an interesting effect.

I’m not sure what you mean when you say it turned out flat. Did you shape the hat on a hat form when it was drying?