My fiancée moved in December and when he moved in, we switched out my ancient shitty saggy spring mattress with his 2 y/o CoolGel memory foam mattress.

Recently when manic cleaning, I've noticed shiny patches underneath the bed of like a weird fiber and it made me incredibly anxious about the idea of fiberglass in the room/house/around my cats but my fiancée assured me it couldn't be fiberglass and so I let it rest--that is until today.

I got home from work with cat vomit on our bed so in frustration, I took off the bed sheet and used cleaner (that had bleach, I know, not good but I wasn't thinking at the time, just wanted to clean) on the mattress. My fiancée came home shortly after and let me know we could just take off the mattress cover so we did. He said he's removed it before to wash it but upon inspection we saw the literal mattress instructions says not to remove the cover.

I saw some shiny long strands in the air a few minutes ago and my anxiety has gotten worse, please help <:( I looked at their website and it says their mattresses DON'T contain fiberglass but it doesn't say their covers don't and I can't help but be super worried about it.

Trying to decide between two mattresses, Zinus Green Tea or Classic brands Mercer gel hybrid. Which bed is better to you guys? I'd appreciate the feedback and help, thanks.

https://www.amazon.com/dp/B00Q7EPLM0/ref=cm_sw_r_tw_apa_i_9YYTJH0AARE3FVN5VW5K?psc=1

https://www.amazon.com/dp/B00LJ7CUG0/ref=cm_sw_r_tw_apa_i_3V72XBGQVP33K7AS1RF4?_encoding=UTF8&psc=1

I see a good deal on a mattress ( https://www.amazon.com/Classic-Brands-Ultimate-Mattress-California/dp/B07BV2PTJQ?th=1&psc=1 ) and ours is about 5 years old and sinks in on both sides. Are classic brand mattress’s any good? Thanks in advance!