I found them easy to make and plan to make more. I have already given one away.
I started with 2 - 10" squares of fabric and 2 - 10" squares of 100% cotton batting.
Layer a piece of fabric with each piece of batting and do simple quilting to hold the layers together.
Sew the darts for the size chosen.
Place right sides together and sew around, leaving an opening to turn inside out.
After topstitching around the edge, it is finished.