Funny how nearly all big name mattress brands begin with the letter 'S'. When my wife and I required a new mattress because of back problems, we tried them all. Then we found out about yet another brand beginning with 'S': Spring Air. We tried one out at the Sleep Shop (Richmond location) and found we liked it better than any other. But still, that was not quite "it". Then the gentleman helping us said, "How about I custom build for you a mattress just like the one I made for myself?" He took us around the parts warehouse and showed us all the components he would layer together. He also said that if we really did not like what he built, we would be under no obligation to buy. We were convinced. Some days later we returned and tried it out. Wow! We enjoy the most comfortable mattress upon which we have ever slept.