This Midweight Down Alternative Comforter contains 100% alpaca fill with no other fillers. This comforter is hand sewn in 6" squares preventing internal fiber shifting that could cause cold spots. The outer cover (case) is made from fine cotton. This comforter is packaged in a reusable, natural cotton drawstring bag. Alpaca's semi-hollow fiber provides four times the warmth and is lighter weight than a down or wool-filled comforter. Alpacas originate from the high altitudes of the Andes where they can withstand both severe cold and summer heat because their fleece is semi-hollow providing an insulating air barrier to the varying temperatures. Much in the same way, this alpaca comforter adjusts to your body temperature changes during sleep or the seasons.