I came up with the sitter pillow in 2014 while taking care of an alzheimers patient. She was leaning to the right constantly and no matter what I did she kept leaning using the regular bed pillows.So that is when I came up with the sitter pillow. They dont fold or move they keep their shape.There are two different sizes the smaller one is known as the back pillow it is used for people with muscles issues that cause them to lean to the right or left. They are also great for the back. They give support to the back when you sit in a chair or you are driving. The longer pillow is known as the foot or leg pillow they are used for people with circulation issues of the legs. Sometimes you have to stack two or three pillows to get the firmness or height you need. Not with the sitter pillow you get the height and firmness you need all in one. These pillows are also waterproof so you just wipe them off and go you never have to worry about waiting on the washer and dryer. The outer layer of the pillows is made of canvas (tarp) that is what makes it easier to keep them clean. I have seen the smile on the face of the people who have purchased a sitter pillow when they are able to perform activities of daily living.