Gel PVC Slipper cold compress:relieve headache,fever,toothache hot compress:relieve arthritis,stomach trouble,...... materia Gel PVC Slipperhelp stimulate ... . 4. non-toxic, non-caustic, reusableUse manual:for hot use, soak it into hot water approx. 80-90 degree Celsius for around ... freezer for half and hour before using Gel Slipper,Cold Pack,Health Care