Material of the pillow core: 100% Polyurethane Material of the pillowcase: 65% Cotton + 35% Polyester Material of the inner sleeve: 100% Polyester Size: 22.1 x 13.4 x 3.9 inches Weight: 2.1 pounds Note: Please do NOT wash the pillow core, as this will cause the memory foam to deform and lose its resilience. Wash the pillowcase only and put the pillow core in a well-ventilated place after using a period of time.🌟 Notes: 🔽 You may feel uncomfortable on this pillow during the first few days, because it takes time to fit your neck contour. You will enjoy a extreme comfort after getting used to it. Usually, you will take 3-5 days to adapt to this pillow for comfortable. 🔽 All new pillow has natural fresh odor from the material, please be assured that smell do not harm to human body. Put the pillow in a well-ventilated place for few days, the smell will be disappeared automatically. 🔽 Please do not expose the pillow to the sun or wash the pillow core. Strong sunlight and water will destroy the structure of the memory foam and the hardness of this pillow. You can wash the pillowcase with warm soapy water, then put the pillow in a well-ventilated place for a while.