M-Line Slow Motion 3 mattress is 22 cm thick and has different layers. Primary support of this M-Line mattress is provided by the openstructure solid HR-foam. The nothes in the top layer differ by each zone. The pressure is well distributed throughout the body. The new top layer consists of visco elastic foam. The cover is anti bacterial. The experience with the Slow Motion 3 is that this is the most soft mattress.