The CHOICE of Firmness
When choosing a mattress, there are some golden rules to go by. First of all, the ratio between height and body mass defines the weight per square centimetre: the higher this is,the more the mattress must be firm.
If you sleep on side, it is recommended you choose a softer multi-zone mattress to reduce pressure on the shoulders and the pelvis thus allowing better flood flow with the resulting cellular regeneration.
If you sleep on your back and you have a pronounced dorsal curvature,it is best to choose a mattress that will allow your pelvis to sink enough so that the lumbar support provided is sufficient.
Age is yet another component. Young people deal with a firmer support better.Over the years, the search for comfort develops and we begin to appreciate a softer layer