Clean, lofty down is at the heart of the Down Duvet Insert. The down undergoes Hypo-cycle, a thorough cleaning process that removes dust and organic residue before the clusters are filled to a lofty 650 fill power. A 230 thread count cotton cambric shell provides a lightweight, tightly woven enclosure for the fill, while baffle box construction gives each chamber room to expand and helps maintain even distribution for consistent loft throughout the night. Double-stitched edges with braided piping reinforce the perimeter with a polished, tailored finish, while corner loops secure the duvet cover and help keep the insert comfortably in place.