Our old mattress seemed to be causing us to have back aches, and we were told to consider a new mattress. We researched and reviewed the various mattress available, but came to the decision to purchase the Sealy Hybrid Kelburn II Firm mattress. Amazing as it may seem, after the first night of sleeping on our new mattress the back ache seemed to lessen and continues to decrease as the nights go by - less and less pain every night. It appears to be doing what it was advertised to do. Seems we made the right move.