What you purchased is a duvet cover set! Duvet covers do need a duvet insert, which fills the cover and makes it fuller and fluffy as you would with a pillow in a pillow case. We have duvet insert options available for purchase in our Bedding Basics section here! To avoid confusion between Duvet Covers and Comforters while shopping on the site, be sure to review the product name as it will list either Duvet Cover or Comforter.