That depends. I can only speak about Aspiration Hair systems. In their case NOT AT ALL! If you are entirely new to hair replacement, during your first weeks of “having hair again” you may notice that something is on your head- only natural as you may have been without hair for years and not used to wind blowing your hair around, etc. After a week or two, it all disappears, and your hair becomes part of you… and you look forward to feeling that great sensation of the wind blowing your hair around.