The fill warmth refers to how
much fill is in the comforter.
More fill will be warmer, and
appropriate for colder weather.
Lightweight is best for summer
months. Midweight can be used
year round. Heavyweight will be
most appropriate for Fall and
Winter months.
Fill Power is a measurement of the
warmth-to-weight ratio, and
quality, of the down fill in a
comforter. The higher the Fill
Power, the warmer and higher
quality the down will be.