Do you also need to double your yoga mat for tailbone comfort?

This is not a problem for me but if it's uncomfortable for you go ahead and double the mat. I'd like to put a towel on top for tactile comfort, and I have also found that my favorite place to do stretch workouts is on the grass with a mat and a towel on top.

I believe it can be very effective to use a thicker yoga mat, or to double up if your tailbone tends to rub against the mat in an uncomfortable way.