What is duvet fill power/weight?

Fill power is related to the way down is inserted into a duvet insert and the size of the down cluster. Larger down clusters come from more mature birds and are considered higher quality because they have a higher loft, sleep warmer, and last longer. Higher fill power can mean more warmth because the clusters are larger and have a higher warmth-to-weight ratio. However, a higher fill power does not mean a higher fill weight. Although both of our down inserts have the same high-quality 650 fill power down, the lightweight insert has less fill weight than the medium-weight insert. 

Fill weight is the amount of fill put into the duvet cover. Depending on the fill type and quality that is used, fill weight can vary greatly to achieve the same warmth. For example, a down alt duvet could have 2-3x as much fill as a down comforter, and still provide the same warmth because down has a higher warmth-to-weight ratio.

• Our down-and-down alternative inserts use the same fill type for both their light and medium weights, with the medium-weight duvet inserts using about 1.5x the amount of fill as our lightweight inserts for both fill types. 
• Our down duvets have a lower fill weight than their coordinating down alternative options because even though our down alternative is very high-quality microfiber, it still has a lower warmth-to-weight ratio than our down. 
• Our duvets are designed to have a similar warmth for their same weight counterpart in the other fill (ex. our down lightweight insert has a similar warmth to our down alternative lightweight insert).