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The Visco elastic sponge was developed to balance the pressure on the spine. This technology was discovered by NASA for astronauts. Due to its structure as soft and flexible as feathers, this special sponge is called Feather Sponge. With the Feather Sponge used on the other side of the bed, a soft touch feeling is aimed at the contact of the body. Silent Sleep HR Sponge has high intensity and high resistance. Thanks to these features, HR Sponge, which is used as a thick substrate under Visco, ensures a balanced distribution of body weight over the surface. Thanks to its structure consisting only of sponges, it provides an ideal environment for a quiet sleep. Removable zipper mattress fabric, bottom and upper part can be dry cleaned separately if desired. It provides two different color options and usage depending on the different uses of the people.