Made of high-elastic polyester, the fabric feels soft, skin-friendly and breathable. It is filled with compressed foam particles (the diameter of the tiny particles is less than 5mm). The cover can be removed and machine washed. With this soft and comfortable all-around sleep pillow, you'll feel like you're resting on soft, comfortable material that supports your head, neck, and shoulders all night long. The egg-trough design secures and supports your head and neck at the ideal sleeping height. Additionally, the higher curve around this groove will help keep your head and neck in the ideal position so they don't twist and become stiff or sore. Well-ventilated, breathable and insulated, it won't leave you hot and sweaty while sleeping. The sleep pillow is suitable for any sleeping position, suitable for both side and stomach sleepers, and as you lie down and choose your sleeping position, the pillow will begin to gently mold to the shape of your head and upper body.