Down comforters can be extremely comfortable, but they also tend to leak feathers. The ends of feathers may poke through the fibres in the comforter fabric and irritate your skin while you sleep. Higher quality comforters with high thread count fabrics allow for fewer feather leaks, but it may still happen occasionally. Loss of fill can be avoided with proper care and maintenance.
Cover the comforter with a protective, zippered liner. Covering the comforter also reduces the frequency with which you will have to have it cleaned to once every three to five years.
Cover the liner with a high-quality duvet cover.
Make your bed daily, and fluff the fill each time to redistribute the feathers.
Sew any large holes in the comforter immediately.