What are the Duvet insert dimensions? August 13, 2025 18:22 Updated Full/ Queen: 88” W x 92” L - Fill weight: 40 OzKing: 108” W x 92” L - Fill weight: 50 Oz Related articles Does the Duvet insert sleep warm? How long will it take for my order to arrive? Can I wash my Duvet insert? Does the Duvet insert work with any Duvet cover? Does Birch offer a wholesale program?