We used filling that has a soft feel. The elastic side fabric provides a soft and comfortable feel. We use highly conductive fabric that is cool to the touch. The shape of the gusset has been devised so that it can also be used as a backrest. If you place it on the back of a chair with the narrowed gusset at the top and bottom and lean back, the cushions coming out from the sides will support your arms just the right amount. Also, if you place it vertically on the backrest, it will provide soft support for your upper back and lower back. It's perfect for holding under your chest or resting your head on when relaxing in the living room. You can wash it in your washing machine at home.