When I saw online I must of read it so many times as I didn't want to get wrong.When it came it I aired it out and put my bedding.As soon I got in bed I felt it was very comfortable not hard , my back pain had gone within a few minutes even if I sit up and rest my legs I can be on my mattress 24 hours but before u couldn't I could get up.In my mattress I can read lie down , do my zoom meetings, training, work without having to keep moving as its stays the the same.