I followed the instructions to open up for 72+ hours before covering in a case to allow it to aerate,which is very necessary due to hardness and smell.It takes a few days to get used to this pillow, is firm, but softens with heat of head, very supportive and you only need to use this pillow. I have arthritis of the cervical spine and before using this pillow getting up was a major painful problem,sleeping was an uncomfortable experience But not any more, sheer bliss, the only problem now is my husband's snoring!!When I do have to change beds the pillow comes too. Would recommend this to anyone with neck and shoulder problems.