What is down fill power and fill weight for duvets?

Down fill power comparison | scooms

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 and 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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    1. What is down fill power in a duvet?
    Down fill power is a way of measuring 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. The down duvet will also recover its fullness more easily when shaken in the morning and is proven to be more durable, so it will last longer.

      

    2. 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. 

    (If you see weight referenced with ‘gsm’ this means the weight of the filling within a square metre.)

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

     

    4. What is a scooms duvet's fill weight?
    These are the fill weights for the different tog rated scooms duvets:

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

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

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    5. scooms down cluster
    This is a close up view of a scooms Hungarian down cluster. The extra fine filaments trap more air giving our duvets a high fill power. This leads to a warmer and more breathable 'cloud like' duvet.

    Goose down cluster | scooms duvets

     

    6. Fill power facts & myths

    True fill power facts:

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

    Untrue fill power myths:

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

     

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    Top fill power faqs:

    What does fill power mean in down duvets?

    Down fill power is a way of measuring the quality and effectiveness of the 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. 

    What does 700 fill power in a down duvet mean?

    Fill power is calculated by measuring how many cubic inches of space an ounce of down takes up when the down clusters are fully expanded. 700 fill power means that one ounce of down fills 700 cubic inches of space.

    What is the highest fill power?

    700 CUIN fill power is the highest fill power for down that is a by-product of the food industry.

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    Bedding size guide

    Duvet size & weight guide

    These are standard UK bedding sizes so if you know your mattress size you can easily work out which duvet size you need.

    Duvet size Duvet weight UK mattress size
    Single 135 x 200cm
    (4ft 5" x 6ft 7")
    4.5 tog - 302g 
    9 tog - 486g 
    All seasons - 788g
    90 x 190cm
    Double 200 x 200cm
    (6ft 7" x 6ft 7")
    4.5 tog - 448g
    9 tog - 720g
    All seasons - 1168g
    135 x 190cm
    King 225 x 220cm
    (7ft 4" x 7ft 3")
    4.5 tog - 567g 
    9 tog - 911g
    All seasons - 1478g
    150 x 200cm
    Super King 260 x 220cm
    (8ft 6" x 7ft 3")
    4.5 tog - 641g
    9 tog - 1030g
    All seasons - 1671g
    180 x 200cm 

     

    Duvet tog rating guide

    Young children can overheat so if they are old enough to be using a full size bed, we recommend using a single size 4.5 tog duvet.

     Tog rating Season / heat Feel
    4.5 tog Summer / hot sleepers Lower thermal insulation
    9 tog Spring & Autumn Cosy medium heat
    All season (4.5 + 9 tog) Winter / cold sleepers Very warm

     

    Pillow size guide

    Our pillows come in two sizes and provide medium support.

    Standard 
    50 x 75cm
    King 50 x 90cm

     

    Bed linen size guide

    Our fitted sheets are deep fit, up to 40cm / 15.7" mattress depth. And our duvet covers fasten with large, easy to use buttons.

    Duvet cover Fitted sheet Pillowcase (pair)
    Single 140 x 200cm 90 x 190cm
    Double 200 x 200cm 135 x 190cm 50cm x 75cm (Standard)
    King 230 x 220cm 150 x 200cm 50cm x 90cm (King)
    Super king 260 x 220cm 180 x 200cm

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