This is the third Sweetnight mattress I have purchased.  (The others were sold when I moved). I have tried several big name mattress in a box, and this is the only one that is firm enough for me.  I am a 65 years old man, with sciatica, knee and shoulder issues, so it important to be comfortable when I sleep. It is reversible, softer on one side and firm on the other, but I have only used the firm side.  I slept like a baby the the first night.  Love it and highly recommend.