This shredded gel memory foam pillow by Sweetnight is the first adjustable-height pillow I've tried and I'm really liking it! You can remove some of the shredded memory foam to get the height you want and a bag in included where you can store extra foam.
It is designed to be comfortable for side, back or stomach sleeping. The Sweetnight pillow has a removable case. The cover is rayon cotton and is machine or hand washable. The stuffing is made of 10% shredded gel memory foam and 90% comfort foam.
Check out our video review of Sweetnight Adjustable Height Pilllow: