No more bad sleeping positions or tense muscles : the structure of this Memory pillow ensures an excellent sleeping position. Its anatomical shape has been designed to envelop the head and neck. Memory foam is weight and temperature sensitive, therefore it molds to your body shape and returns to its original shape when pressure is removed. - Polyurethane visco-eleastic memory foam. Height 4" (10 cm). Width 12" (30 cm) - Cover 75 % cotton and 25 % polyester, machine washable at 60°C