WARMTH (Insulation) FACTOR

Formula for IDFL Warmth (Insulation) Factor:

( Fill Power (cubic inches) X Net fill weight (grams) ) / Size (cm2)

EXAMPLE

The following three comforters from Europe are used as examples.

Comforter # 1 is a 2-part four-season comforter which can be attached together or used separately.

Comforter # 1-a | Light (Summer use) | Warmth Factor = 8.72
Comforter # 1-b | Heavy (Winter use) | Medium (Spring/Fall use) | Warmth Factor = 11.34
Comforter (1a+1b Combined) | Standard Comforter | Warmth Factor = 20.05
Comforter # 2 | Standard Comforter | Warmth Factor = 18.11
Comforter # 3 | Standard Comforter | Warmth Factor = 18.64

DETAILS OF CALCULATIONS