Forty years of experience of high quality down
We have worked with down as an insulation for more than 40 years and we only use down that meets the highest quality standards. This means that a Fjällräven down jacket or sleeping bag offers an unbeatable ability to insulate in relation to its low weight. You will also notice how well our down products can be compressed to take up minimal space in your pack. When you buy a down product, you should primarily check to make sure it has a high CUIN and a good blend of down and feathers. You can read more below about what this actually means.
High quality down products are often rated on their "fill power". Fill power is a measurement of buoyancy or "fluffiness". It measures how much of one cubic inch is taken up by one ounce (27.3 grams) of down. This is called CUIN (cubic inch per ounce) or fill power. The higher the value the better the insulation.
A down product with a higher fill power weighs less and is more compressible than a similarly warm product made with a lower quality of down. Fill power of 400–450 is considered to be average quality, 500–550 good, 550–750 very good and 750+ excellent. Many of our down products have a fill power over 600.