Enjoy the best posture possible while sleeping on the silentnight miracoil 3 classic mattress which features the unique miracoil spring system the mattress consists of one continuous spring that runs from head to toe to distribute weight up and down the mattress the miracoil spring system also eliminates roll together so you and your partner can both have the most comfortable nightrsquos sleep without rolling into each other this firm feel mattress also has extra springs in the centre of t