The justkids memory foam mattress features a top layer of memory foam upon a highly supportive and durable reflex foam base creating a comfortable sleep environment for the perfect nights sleep r this 15cm deep mattress is encased in a cotton cover the cover is zipped for easy removal and machine washing up to 40 degrees r the memory foam layer provides comfort and support for your growing child and works in harmony with their body to ensure that they are sleeping in the correct anatomical p