The mattress is quite comfortable, firm but not hard; the lavender sent is a little much with doors closed but I like it - I'm sure it will dissipate some over time. It is 12", a little larger than 76x80, more like 78x82 but I'm ok with that as deep pocket sheets fit perfectly. We have only had this mattress for under a week, but overall it seems to be a good purchase and would purchase again.