The 6901 is a 13" Euro-Top available in Queen or King featuring a premium knit cover with an additional comfort layer. The comfort and support foams are crushed to minimize the initial softening and lock in the comfort to feel like new longer. Certi-Pur-US foams are made without ozone depleters, harmful flame retardants, formaldehyde and phthalates, and are free of mercury, lead, and other heavy metals. 504 alternating, offset coils provide increased support, reduced roll off, and promotes better comfort, support, and alignment than traditional coils. The coil systems are encased in foam to provide more sleeping surface and improve edge support. 7 year non-prorated warranty