How the number is produced
A weighed sample of down is conditioned, dropped into a cylinder and left to expand under a light disc. The volume it settles at, divided by the sample weight, is the fill power. Larger, more mature clusters trap more air, so they fill more space per ounce.
Because it is a volume-per-weight measure, fill power says nothing by itself about how much down is inside a finished comforter. Two comforters can share a fill power and sleep completely differently if one holds more fill than the other.
What our range feels like
We build across four fill powers, and the difference between them is felt in the hand long before it is felt in warmth.
- Same warmth, less weight as the number climbs
- Higher fill power recovers loft better after years of use
- Lower fill power is not lesser down — it is a different feel
When the higher number is worth it
If you dislike weight on you, or you want one comforter that works most of the year, spend on fill power. The piece will be lighter, drape more softly and hold its loft longer.
If you like the grounded feeling of bedding you can sense, a 560 or 650 will make you happier than a 920 — and cost less. That is a preference, not a compromise.
What matters just as much
The shell decides whether the down stays put. Our shells run from 233 to 360 thread count in tightly woven cotton, which keeps clusters in and still breathes.
Construction matters too: baffle boxes give the down room to reach its full loft, while sewn-through channels sit flatter. And traceability matters — our down is RDS certified and our fabrics are OEKO-TEX® certified, which no fill power figure tells you.