This is the perfect pillow for placing under my knees to help relieve pressure on my back to sleep. Just the right softness and size, not too fat or too big to put it on under between my knees when I rolled over to sleep on my side because my knees hurt when I place one on top of the other, but with this tiny pillow in between it's perfect. I also just used the second one to take with me on a long flight (trip), placing it behind my lower back for support as I find the airplane seats very uncomfortable and have no support for my back. This size pillow is absolutely perfect for my needs! I intend to buy another set to give to my family for the same purpose.