ZINUS 12" Green Tea Memory Foam Mattress

FIRM and caused health issues. Worst experience I have had with Amazon so far. I read multiple reviews stating this bed was soft, and the description says it is medium plush firm, but it gave me horrible neck, and back problems. It literally felt like it bruised my ribs after sleeping on it, as it hurt to breathe on my left side. My neck still hurts to this day, even though I am now using a new mattress, which worries me that it actually caused long term damage just in a few days of use. Trying to return it has been a joke. The site keeps taking me back to the return center without starting the return. Which has never happened before in trying to start a return. The associate I finally had a chat with did not apologize for my troubles even though I told them about my health issues from the product, and they said they would assist with the return label, and I would have to buy a box to send it back in (after I said it seemed impossible to return in the original box without the assistance of machines). I said that was unacceptable and a box that size would be over $100, if they even make them. The chat then ended with a "we have hit a snag in our chat". I'm not sure what is going on with Amazon lately, but they have been extremely unprofessional and I certainly expected more assistance than what I received. Zero rating experience. The product seems worth closer to $250 for a king, as it was not comfortable like a typical memory foam mattress, and using a 3" memory foam topper actually made it worse! Ive never used a mattress before where the topper actually makes it more uncomfortable. Highly unusual. It honestly kind of reminds me of the foam used in the seats of cars. It's that firm. When you press on it it squishes down, but when you lay on it it does not feel like it forms around your body whatsoever. In fact I was worried about it after unboxing it, as it immediately inflated to full size. After waiting 24 hours and checking back in on it, absolutely nothing had changed (which is why the thought of trying to box it back up is ridiculous). Don't be fooled by their extended return window, as they make it seemingly impossible to return. I should have known better then to buy a Zinus. My kids are currently using Zinus mattresses since my dad bought them for them, but have always complained about them being too hard until they put a topper on it. Then for them it feels like a cloud. This one was not like that at all. The cover also seems cheap and my cats have already managed to snag it, which is horrible since the cover is the only thing separating you from the fiber glass used in Zinus memory foam mattresses.