Reflex foam, like memory foam is also high density foam, but is constructed in a different way using larger bubbles. When pressure is applied to these bubbles they act in a similar way to water in a balloon - the air does not escape, and instead is displaced ‘sideways’. Once pressure is relieved, the bubbles spring back into shape and the mattress retains its shape. It’s for this reason that the reflex foam mattress is as popular as an orthopaedic mattress, as it offers a firm but comfortable mattress option. Reflex foam has also been found to be one of the best supportive layers / base foams to be used in the manufacture of many foam mattresses.