I've got your world's best pillows--RIGHT HERE! :laugh:
They're down--I have 3 different ones, in varying sizes and firmness. Down is kind of screwy in that it comes in different "Fill Powers"--how many cubic inches an ounce of down will fill. The higher the number, the lighter and fluffier the down. A higher number is considered better quality, and is supposed to hold up better. Then you have to look at how many ounces of down are in the pillow/comforter/etc. Multiply your ounces by your fill power to get the cubic inches the down will fill--an indication of how firm the pillow will be. Looking on line, it can be tricky finding all the information so that you can compare apples with apples. If you can see them in person and try them out, it's best and you don't have to worry about the math or grade of down. Or find someone with a good return policy. I've got a Ralph Lauren that's a little too firm, a Lands' End "soft" that usually feels just right, and an old one that's somewhere in the middle.
I have a big washer/dryer so I wash my down pillows occasionally. The trick is to get them really dry, or the feathers can mold.
I get hot at night, and find the down pillows cool enough to be comfortable.