The top layer of 4G Air memory foam provides the ultimate in comfort & support, whilst ensuring that you don't get too hot during the night. The open-cell structure of 4G Air memory foam encourages air to flow through the mattress, wicking away excess heat & moisture naturally to create a fresh & hygienic sleeping environment. Cooling Open Cell Foam Beneath is a layer of Revo technology foam, which shares the cooling, open-cell structure, described above. This provides just the right amount of bounce in your mattress without the need for traditional pocket springs. Supportive Reflex Base The extra deep reflex foam base provides high levels of support, & creates a durable & long-lasting mattress. Coolmax Memory Foam Technology This affordable memory foam mattress comes with a Cool Max® mattress cover which is removable & washable at 30ºC. Coolmax® fabric technology wicks away excess heat & moisture, to prevent you from stirring. Mattress Delivery The Coolmax XL 30cm Memory Foam Mattress is normally shipped same day on orders before 1pm & delivered within 1-3 working days as a rolled up mattress, allowing you to move it into your room of choice quickly & easily.