General Note: Please allow 24 - 72 hours for your mattress to regain its full shape; memory foam will expand faster in a warmer room. The expansion time of the mattress will vary as per the surrounding RESPONSIVE HYBRID DESIGN: The contouring comfort of memory foam and the durable, bouncy feel of steel springs come together in one hybrid mattress to create our most popular mattress ever UNBEATABLE VALUE: Comfort meets value when it comes to this affordable Twin size mattress, it’s made with durable materials to give you and your family good sleep for many years to come