The Sleep Philosophy down alternative comforter collection features 3M Thinsulate Featherless Insulation-600 Fill Power. This revolutionary, loose fill down alternative mimics or surpasses the performance of natural down in Fill Power, loft and overall performance. Made of durable, lightweight polyester fibers, 3M Thinsulate Featherless Insulation provides warmth without a single feather. The comforters have sewn through box quilting so that the down alternative fill doesn’t bunch or shift. They’re also hypoallergenic so you’ll have a comfortable "sneeze-free" night’s sleep. Great sleep, it never goes out of style. That’s our Sleep Philosophy. This Level 1 down-alternative comforter is perfect for year-round warmth. Filled with 3M featherless fiber, this revolutionary, loose down-alternative fill mimics or surpasses the performance of natural down in fill power, loft and overall performance.