Our Wyoming King Down Duvet Insert is crafted with the highest quality 100% cotton 230 thread-count sateen shell and filled with pure triple-washed 100% down. A unique sewn-through bafflebox construction to keep the filling in place and to maintain an even layer of fluffiness Available in two filling weights that are both ultra-lightweight yet warm for a comfortable night's sleep. Proudly Made in USA ÂÂ