Insulates by absorbing the air, it keeps us a warm body temperature.
Classified according to fill power, which is dependent upon the size of down and its fibers, as well as their ripeness. The thicker the down, the more flexible, thus creating a better insulating layer by occupying more space. Fill power is measured by CUIN (cubic inch/oz) that shows how many cubic inches of space one oz of down occupies. Down measured under laboratory conditions can have fill power from 300 up to 850+ CUIN. Every single KHIBU Quilt is manufactured with the use of down fill, providing maximum protection against cold temperature.