Fill energy is used to measure the heat of the goose-down and duck-down insulation in down jackets, down sleeping luggage, and down quilts. Expressed as a quantity, fill energy measures the flexibility of right down to entice the nice and cozy air heated by your physique in a down jacket or down-insulated sleeping bag. For instance, a down sleeping bag insulated with 900 fill-power down sleeping bag shall be hotter, lighter weight, extra compressible, and far more costly than a 650 fill-power down sleeping bag, if each are insulated with the identical quantity of down by weight.
Sadly, the heat of artificial insulation just isn’t measured utilizing fill energy, which makes apples-to-apples comparisons tough. However as a rule of thumb, the artificial insulation present in insulated jackets and artificial sleeping luggage is equal to 550 to 600 fill-power-down insulation. that means that it requires extra artificial insulation by weight to provide the identical heat as a better fill energy down.
This can be a helpful comparability relating to shopping for insulated jackets and sleeping luggage, particularly if value is a consideration. It means you should purchase a a lot cheaper 650 or 750 fill-power down jacket or down sleeping bag that’s hotter, lighter weight, and extra compressible than an costly top-of-the-line artificial jacket or artificial sleeping bag. The producers of artificial insulation comparable to Primaloft (Polartec), Coreloft (Arc’teryx), VerticalX (Outside Analysis), and others don’t exit of their strategy to clarify this, however I assumed it is best to know, particularly if in case you have budgeting constraints.
However the superior weight-to-warmth ratio and value aren’t the one causes to decide on 650 or 750 fill energy down over artificial insulation, however they’re necessary components to think about relying in your location and exercise stage, as proven beneath.
|Chilly, dry climate
|Chilly and damp climate
|Goose or duck down
|Loses insulation potential when moist
|Heavier, Not as compressible
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