Clinically proven to improve quality of sleep and reduction of neck pain layer of super soft hypoallergenic polyester fibre floats over a water layer providing outstanding comfort adjusts to fit your shape and continuously responds to changes in your sleeping position firmness can be personalized to your preferred comfort level cover 100 cotton filling 100 fr fire retardant polyester fiber machine washable71cm x 51cm x 11 5cm 28 x 20 x 4 5