This organic buckwheat hull pillow conforms to you offering the best cervical support (whether you are a side or back sleeper) that Chiropractors recommend. These thermodynamic pillows don't conduct heat helping to maintain the perfect body temperature all night increasing your chances of a deep, restful sleep. WheatDreamz pillows aren't like the others - its 4 lbs. of hulls are organically grown in America, non-fumigated and enclosed in a durable, soft unbleached organic cotton twill shell. This shell features a hidden zippered opening which allows for adjustability and emptying the hulls to launder the shell. Large is 20" x 27". You provide your own pillowcase. Small is 17" x 21". Comes with Organic unbleached cotton pillowcase.