This mattress is firm even for a medium so if you're looking for a sink-into cradle-like mattress this is not the one. having said that the description of the mattress is accurate. We added a mattress topper as some reviews mentioned it does not inflate to a full 10 inches. I may have ordered a twelve inch mattress but it works. The ease of the mattress being shipped to door and the bed in a box type is convenient.