Finding these mattresses can sometimes be a challenge as the truly firm ones are often few and far between. If you are after such ultra firm bed, perhaps for therapeutically reasons, or perhaps you simply grew up sleeping on hard bed, Zzz Atelier Assured Firm may just be your perfect answer.This mattress is not for everyone. It has been designed specifically for those who seek very firm mattress. The core support layer of this mattress is made of triple tempered, extra thick coils for maximum support and stability. Its independent pocket spring design also ensures that shock and pressure is effectively absorbed and dispersed throughout the mattress. The tight top comfort layer is made of ultra high density foam to guarantee that comfort and firmness of this mattress remains unchanged for many years to come.This mattress is covered in comfortable Turkish organic cotton blend fabric that is soft on skin and highly effective in absorbing and dissipating body moist. Having passed the strict OEKO-TEX Standard 100 test, the quilting fabric also gives you the peace of mind of being away from substances harmful to human bodies.