What are hotel pillows made of?

What’s the material used in the hotel pillow? where to buy these?

Common hotel pillows are polyester pillows that are resilient.

@chicken-dinner We place eco down pillow in all rooms – that’s common in all rooms as default, its polyester.
But we also offer a pillow menu, that’s guest choice.

@Joao Can you please tell which pillow is most preferred by guests.

@chicken-dinner The default pillow – polyester fiber pillow is the most preferred by guests.
Some guest prefer comfort pillow which is soft
Some prefer down& feather – this is goose down & feather pillows