Finally got the actual pillow in.
This is my first Daki so I have nothing prior to compare it to.
In my opinion it feels great, and it retains the cold very well which is a huge plus to me. (In all fairness that may also be in part to the actual pillow, but I am not 100% sure)
Not sure what the actual material is I looked for a tag but I couldn't find it right away, I will assume polyester.
I am actually 100% satusified with FAKKU's first official Daki and I look forward to more with the same quality.
Last thing I wanted to add is that the art just looks stupendous in real life, Napata-Sensei did an amazing job with it.