cuz they are comfy and they support your head. they also give u something to lean on.
umm maybe its because they are round and look a little like cushions im guessing?!.
that depends on when the pillow was made!
I just washed mine 30 min. ago with my bissel spot bot...it pretty much rocks
With a fan The patting method also works well, and mixing 1tsb vinegar to a cup of water can get rid of any water marks/lines that may appear