What is down fill power and fill weight for duvets?

Down fill power measures the quality and effectiveness of the loft or fluffiness of the down in a duvet. A higher fill power means the down duvet will be lighter and provide better insulation. Fill weight is the actual weight of the duvet filling. 

Down fill power vs fill weight key facts: 

1. What is down fill power in a duvet?
2. What is down fill weight in a duvet? 
3. What is a scooms duvet's fill power?
4. What is a scooms duvet's fill weight?
5. scooms down cluster
6. Fill power facts & myths

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What is down fill power in a duvet?

Down fill power is a way to measure the quality and effectiveness of down in a duvet. The fluffier the down is, the greater the number of air chambers and therefore, the more effective the duvet is at insulating. So, a higher fill power means the down duvet will be both lighter and more insulating. A down duvet will also recover its fullness more easily with a daily shake and is proven to be more durable, so it will last longer.

Duvet CUIN: Fill power is measured in CUIN which means 'cubic inches per ounce'.

What is down fill weight in a duvet?

Don't confuse fill weight with fill power! Fill weight is the actual weight of the duvet filling. The higher the fill weight, the heavier the duvet. However, a heavy duvet does not equal a warmer duvet.

Fill weight determines how soft or firm a duvet is but, fill power measures the effectiveness and quality of the down or feather duvet filling. So, a duvet with high fill weight and low fill power will be heavy but provide poor insulation. 

Fill weight meaning - If you see weight referenced with ‘gsm’ this means the weight of the filling within a square metre. 

Our duvet gsm fill weights:

• 9 tog duvet: 180gsm.
• 4.5 tog duvet: 110gsm.
• 2.5 tog duvet: 80gsm.

What is a scooms duvet's fill power?

scooms Hungarian goose down duvets have high 700 fill power. Technically called 700 CUIN fill power. 700 fill power is the highest fill power you can get for down that is a by-product of the food industry.

What is a scooms duvet's fill weight?

These are the fill weights for the different tog rated scooms duvets (not the total duvet weight).

Duvet fill weight chart:

* Single: 9 tog - 486g, 4.5 tog - 302g, 2.5 tog - 220g, All season - 788g 
* Double: 9 tog - 720g, 4.5 tog - 448g, 2.5 tog - 320g, All season - 1168g 
* King: 9 tog - 911g,  4.5 tog - 567g, 2.5 tog - 400g, All season - 1478g
* Super King: 9 tog - 1030g, 4.5 tog - 641g, 2.5 tog - 480g, All season - 1671g

If you're not sure what a tog rating is, then find out more in our Tog rating guide.

Down cluster and down loft explained

This is a close up view of a scooms Hungarian goose down cluster. The extra fine filaments trap more air giving our duvets a high fill power, which essentially means greater loft. This higher loft leads to a warmer and more breathable 'cloud like' duvet.

Duvet fill power guide - facts & myths

True fill power facts:

• The higher the fill power, the larger the clusters of down.
• The higher the quality, the more durable the loft and fluffiness.
• The larger the cluster of down the:
• higher the quality
• more air it traps.
• higher the loft.
• better the insulating properties.
• larger the cluster of down, the lighter weight the duvet.

Untrue fill power myths:

• The higher the fill power, the:
• firmer the duvet.
• heavier the duvet.
• higher the fill weight.

 Need to know more, see our Hungarian down duvet guide.

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