Is this comforter warm enough for winter?

It is rated all-season, so it suits most heated bedrooms year-round. Sleepers in very cold rooms or who like heavy bedding may want a higher fill power or a winter-weight comforter.

Is it real down or a down alternative?

It uses a blend of down and feather fiber, not a synthetic alternative. Anyone avoiding feathers, including some allergy sufferers, should look at a down-alternative comforter instead.

What does 600 fill power mean here?

Fill power measures how much space an ounce of down fills; 600 is mid-range. It is loftier and warmer for its weight than most polyester fills but below 700 to 800 fill down comforters.

Does it need a duvet cover?

Yes. Like most down comforters it is designed to be used inside a duvet cover, which protects the fill and is easier to wash than the comforter itself.

How does it compare with a higher fill power comforter?

A 700 or 800 fill comforter gives more warmth per ounce and often a softer, purer down feel. This one trades some of that for a lower fill tier and a feather blend.

Is it good for hot sleepers?

Down breathes better than polyester, and the all-season weight is not overly thick. Hot sleepers should still expect more warmth than from a lightweight summer quilt.