First I tried the Gel pillow, but for me it was way too firm and I had a neck ache.  The flex is just right.  Once I started using it, the neck pain was gone. Pillows are a matter of taste for each person.  I suggest this one for those who like softness and pillow top.  Thickness is just a matter pulling out some foam (saving in a ziploc for future adjustment) and I had to pull out quite a bit.  The foam is super soft.  Note* The standard/Queen pillow doesn't fit inside the Cariloha standard/queen pillow case and sticks out at the end!  I wish Cariloha would address this in future sheet sets, as the cases need to be longer.