Each seat cushion comes with a removable cover that is machine washable and helps protect your pillow. The 3D mesh keeps the cushion from getting too warm, wicks away moisture, and adds an extra layer of comfort. The gripped, non-slip bottom prevents slippage and keeps the pillow firmly in place. Each coccyx cushion comes with a small handle that allows you to take it anywhere. Whether you're using it in the car, office, or on your commute, you can easily take this pillow along with you.