The DWR Sonno Prima Mattress raises the bar on superior comfort another notch by combining visco-elastic memory foam with Invista's patented ventilating fabric CoolMax. This two-sided gradient fabric is made to wick moisture away to help the body maintain an ideal temperature while sleeping. And knowing that sleep preferences vary, we offer the Sonno Prima in two distinct densities, Firm and Medium. Unlike other memory foam mattresses, the Sonno immediately adjusts to suit your body position without requiring a "warm up" period, and holds your weight whenever you roll. The result is a feeling of floating, which allows you to rest naturally, isolated from vibrations and movement that interrupt sound sleep. DWR Exclusive.