The outer pillow is stuffed with a down-alternative that feels comfortable towards the touch. The core from the pillow is filled with shredded Talalay latex. Although down pillows give final fluffiness for that sleeping-on-a-cloud experience, they sometimes don't have ample height for good neck alignment when sleeping on your side: https://mypillowworld.com/best-pillow-for-side-sleepers-with-arm