Description: High elastic polyester spandex, fabric breathe freely, filling compressive foam particles(tiny particles diameter less than 5mm) and the cover can be take off and wash in the washing machine. With and comfortable sleep pillow, you'll be feel you' it down on a soft of comfortable material that can support your head, neck, and shoulders throughout the night . Egg groove design, it holds and support your head and neck at an ideal height for sleep. Also, the higher curves that surround this groove will help keep your head and neck in this ideal position so they don' about and become stiff or sore. Well-ventilated breathable and insulation, it won't make and sweaty while you sleep. The sleep pillow fits any sleeping position, will accommodate side sleepers and stomach sleepers, when you've laid down and chosen your sleeping position, the pillow will begin to gently conform to the shape of your head and upper body. Specification: Material: Polyester+Foam Size: approx. 50x30x10cm/ 19.7x11.8x3.9inch Package Includes: 4 Pieces Sleep Pillows Note: Colors might be different due to different monitor display. Please allow slightly difference in size due to manual measurement.