This topper offers wonderful support, relieves pressure, & helps to improve your sleep patterns.- Filled with 45D memory foam for a perfectly supported body- Removable polyester casing for ease of washing- Non-slip feature on casing under side- 5cm depth adds responsive support- Firm & supportive Memory foam was invented by NASA to reduce cabin pressure during take-off, & its potential was soon spotted by bedding manufacturers! Those dense, heat-responsive properties make it perfect for giving a firm sleeping surface, reducing resistance, relieving pressure & letting your body find a natural shape. The casing can be zipped off & washed at 40°C for ease of cleaning. It's non-slip reverse means it attaches to your bed simply.