Forum:Book of Moon VS Xyz materials

First, please forgive me, as I'm on my phone and as such Forum Search is less than useless. Also, I have almost no experience playing with Xyz monsters (shocking, I know,)

That said, If I turn an Xyz monster facedown, will its Xyz material "fall off" or will they remain. Thanks for your patience- Sabre Knight (talk • contribs) 18:22, April 18, 2014 (UTC)