The relyon pocket serenity 1500 mattress with aircool consists of a double layer of pocket springs with a layer of ventilated memory foam this means it will perfectly contour to your bodys shape and provided you with a good nights sleepthe pocketed springs are encased with foam featuring extra deep foam border to provide added comfort and support the hi tech border features aircool technology which provides a consistent flow of air within the mattress helping to keep your mattress cool fr