Mattress toppers are designed to lie on the top of an existing mattress. They are made primarily of memory foam. Their function is to provide a layer of comfort and warmth between the user and the mattress. They are of particular benefit when the existing mattress is worn or uncomfortable. Visco-elastic memory foam toppers are regularly used in medical institutions because of their pressure relieving properties. The foam used in the construction of these memory foam toppers reacts to both pressure and temperature and contour to your body shape alleviating pressure and gives the characteristic of  weightlessness.