"...Focusing on milkweed floss properties important in the down market, we found that floss is: a non-allergenic cellulose fiber; with a fill-power of about 350 cm3/g which is comparable to high quality goose down; white in color; 50% more breathable than down; 20% more durable than down; and 10% warmer per unit of weight than down."http://www.hort.purdue.edu/newcrop/proceedings1993/v2-422.html Natural Fibers Corporation