A Zafu Is A Round Cushion Also Known As The Zen Cushion Used In Meditation In Japan. You Can Place It Over Your Mat Or A Zabuton During Your Practice. It Is Filled With Buckwheat Hull And The Cushion Cover On The Zafu Is 100% Cotton. A Zafu Placed Under The Hips Lifts Your Upper Body Slightly. It Is Good To Sit On A Zafu If Your Work Involves Sitting For Long Hours.