These incredible Eiderdown comforters are a custom order, and are covered with a 300 plus thread count silk. This makes them down proof but with a nice luxury feel. Then we would reluctantly put the finest of silk duvet covers on the comforter to prolong the life of the Eiderdown. The manufacturer claims they are Hypoallergenic, but at this price if you have any doubt, ask about our sample program. For more information on what exactly is meant by Hypoallergenic click here.