THESE HOT COLD THERAPY BAGS ARE TRIED AND TRUE.  I HAVE SOLD THEM FOR MANY YEARS.  THEY ARE EITHER A COTTON FABRIC LINED WITH MUSLIN OR THEY ARE FLANNEL 100% COTTON FABRIC ON THE OUTSIDE.  THEY ARE FILLED WITH APPROX. 2.5 - 3 LBS. OF CORN.  THEY CAN BE WARMED IN THE MICROWAVE FOR HEAT THERAPY OR PUT IN THE FREEZER FOR COLD THERAPY.  THEY MEASURE 6" X 19" AND ARE GREAT FOR THE BACK OF THE NECK, THE BELLY, THE CHEST, KNEES...ACTUALLY ANYWHERE YOU HURT.  EXCELLENT GIFT FOR ELDERLY.  GREAT FOR INJURIES IN PLACE OF ICE. GREAT FOR MENSTRAL CRAMPING AND JUST REGULAR ACHES AND PAINS. THESE ARE UNSCENTED AS FAR AS ESSENTIAL OILS AND SUCH ADDED.  I HAVE A MINIMUM OF ONE AVAILABLE OF EACH FABRIC SHOWN.  *PLEASE INDICATE TO ME WHAT FABRIC PATTERN YOU WANT.  MY FEEDBACK SPEAKS FOR ITSELF.