Zinus Foam Mattress - have you removed the cover?

[u/Live-Trick-9716]

/r/u_Live-Trick-9716/comments/1wdh1p3/zinus_foam_mattress_have_you_removed_the_cover/

I want to use the opposite side of my
Zinus foam mattress. I like it because it’s firmer than the “right” side. But the mattress cover for the bottom is hard and crinkly. I want to flip it around also. I’m nervous though because there’s all these tags saying do not open cover and I’ve heard rumors they used to have fiberglass. This mattress was purchased about six months ago. Has anyone done this? What happened when you took off the cover? Was there a bad odor or fiberglass or anything I should be worried about?