Slip your favorite Mike & Co. New York pillow cover over this pillow insert to easily update and refresh your home decoration. Cover material is made from 100% cotton. This pillow insert is filled with high-quality polyester, engineered to have hollow air cores to help them resist clumping and matting providing maximum comfort and softness. It is non-allergenic and resistant to mildew, long-lasting and durable, and offers a neutral color that doesn't show through your selected pillow cover. The inserts are vacuum packed and would require some time to fully expand and be fluffy.