The perfect blend of X’treme’s fine comfort and firm support features, brings extremely good support for your ultimate comfort and wellness. the Spine support foam gives extra support your spine needs, while the posture coil maintains your backbone firmly, resulting in a healthy spine.Completed with the comfort of exclusive Belgium knit and 3-D mesh, this mattress will give you a healthy and comfortable nigh’s rest. Spine Support Foam 3D MEsh 3D MEsh Foam Encasement Foam Encasement 5-Zone Pocket Spring 5-Zone Pocket Spring Solid Curve Foundation Solid Curve Foundation