Standard Extra-Thick: 12" W x 20" L x 4½" D
I've tried over fifteen pillows - some were Tempur-pedic imitations - and none of them gave me the neck, head, and shoulder support that the Tempur-pedic pillow does. I used to have bad neck aches, but most of that vanished when I used the Tempur-pedic pillow. Yes, it is a little costly, but consider that you spend almost one-third of your day in bed, it's worth it.
I have a weak shoulder and now, with this pillow, I am getting the right support when I sleep and my shoulder and neck have improved dramatically!