No doubt the best cervical alignment & pain relief pillow I’ve ever tried!  I was in car accident 20 yrs ago & neck has never been completely pain free.  Regular or even memory foam pillows leave me with next pain in the morning.   But I am disappointed that this pillow - with all its fabulous factors - they do flatten over time so I must then invest in another.  This will be my 4th purchase, so I do keep coming back to it!