Fill power is the most frequently used measure of down quality. Fill power can be expressed as cubic inches per ounce (in³/oz). For down sleeping bags a lofting power of 600-650 is considered good quality, 700 – 750 is considered very good, and 800 – 950+ is considered excellent.Click to see full answer. Hereof, what does 650 down fill mean?The down fill rating number is a measurement of down quality, meaning the cubic inches of loft one ounce of the specific down produces. A higher rating means less down fill is required to capture the same amount of heat. But that doesn’t automatically mean a 900 fill down jacket is warmer than a 650 fill down jacket.Likewise, what is a good fill power for a down jacket? As less down is required to provide the same amount of warmth, jackets with a higher fill power tend to be lighter and more compressible. Fill power ranges from 400 to 900. Down Jacket Fill Power Ratings: Fill Power Rating 400 – 450 Medium 500 – 550 Good 550 – 750 Very Good 750 – 900 Excellent Then, is a 650 fill power warm? A jacket with 300g of 550 fill down, for example, will provide more warmth than one with 120g of 800 fill down. Slightly lower fill power down (i.e. 650-700 fill power) is sometimes used in high-contact zones of some active garments.What does fill power mean in coats?The fill power number on your jacket comes from a standardised lab test and indicates how many cubic inches one ounce of down occupies with a standard weight resting upon it. A higher number means the down takes up more space and is capable of trapping more air.
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