Outlast is a wonderful fiber! This comforter is the perfect King size, fluffy like down, and NEVER too hot, as a down comforter can sometimes be! Also, I don't have to feel guilty - that ducks and geese have been tortured by having their feathers ripped off them, and left freezing and bloody - just so that I can have a warm comforter!!! This is my second Outlast purchase - I also have the King size Merino Wool/Outlast blanket, which is so superb that it led me to purchase this wonderful comforter. Now, I'm going to look into the other bedding that contains the Outlast fibers - what a wonderful invention!!!