Our Orthopedic semi-firm Reversible is made with our Unified Pocket coils. This means that the pocket coils are held together with a top liner rather than being truly independent like our Energy and Davinci models. This means that the mattress will have a bit more motion transfer. This is a great budget friendly mattress that will last a very long time because it's reversible. The mattress is finished with our breathable bamboo fabric.