The finest quality Down Comforters will have a fill power of at least 600. They will be of baffle wall construction and have a high thread count, 100% cotton cover. They will provide lightweight, year round warmth and come with an extended warranty.
 

Fill Power

The measurement of the quality of the down. The higher the fill power, the fluffier the comforter. The benefit is that less down is needed to fill the comforter, resulting in lightweight year round warmth. Look for down comforters with a fill power of at least 550. More luxurious quality down comforters will have a fill power of at least 600.

Construction

Baffle Wall Construction- The finest quality Down Comforters will be of baffle wall construction. Baffling or baffle wall refers to sewn in cloth walls which help keep the down from shifting, thus preventing cold spots.

Hypoallergenic- Down that has gone through a series of steps to remove all the impurities, dirt and dander, will be noted as hypoallergenic or allergy free. Most people are not allergic to down, but rather to the impurities within the down. Not all Down Comforters are hypoallergenic.

Thread Count- The number of threads per square inch of fabric. The finest quality Down Comforters will have a 100% cotton cover with a thread count of at least 200. The higher the thread count, the more durable and softer the cover will be. A higher thread count cover will protect the down from impurities as well as keep the fill inside the comforter. A 100% cotton cover will be breathable, lending to the insulation and fluffiness of the comforter.

Climate

Think about the climate where you live and whether or not you are looking for a down comforter to be used all year long, or only in the winter.  If the whether in the winter where you live not usually very cold, an all year round down comforter should work fine in the winter for you.   

Once you decide on a down comforter you may want to consider purchasing a duvet cover for it.  A duvet cover helps keep your down comforter cleaner and also helps slow the process of wear and tear.  Our affiliate Wrapables has a selection of Duvet covers.