Never fully rose to 6 in, pretty firm but not terrible

I purchased it almost a month ago and received it quicker than I thought I would (which was nice). It's pretty good for the price. I bought the 6 in mattress and it never fully rose to 6 inches, I would say it's about 4.5. It's pretty flat and firm, doesn't give much. I ended up buying a 4 inch memory foam topper and hope that will make it more comfortable.

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