The next few steps might seem a
waste of time, but believe me, they add a lot to the
comfort of the hot pack. Mark the middle of your
body-piece and then fold the sides towards the middle.
Mark those fold-lines as well.
This doesn’t have to be too
exact, but once it’s marked you should have 4
approximately equal parts. Starting about 2” from the
first mark, sew along the short inside edge of the
curve, stopping again about 2“ before you reach the mark
on the other side.