Every Yogabed features Instant Response FoamTM as the top layer of the mattress. It combines the properties of gel memory foam and latex foam – but without containing any latex! This foam provides the same pressure relief as regular memory foam offers, sleeps cool due to its gel content and also provides support. It helps prevent back pain and other spinal issues that can be promoted by mattresses that do not provide the level of comfort and sufficient support that Instant Response Foam offers.