Get a cozy night's sleep with the Royal River Trading Primary Down Duvet Insert by Cuddledown. The Royal River Trading Primary Down Duvet Insert is available in Twin, Full, Queen, Oversized Queen, King, and Oversized King sizes. The insert features a fill power of 700 European white goose down which is light, lofty and warm. The duvet insert is offered in a level 1 warmth and also features 100-percent cotton sateen fabric with a 400 thread count which is light and breathable and extra soft. A level 1 warmth is the most popular and provides you the warmth of two blankets without the heavy weight of two blankets. The Royal River Trading Primary Down Duvet is hypoallergenic.