Gel PVC Slipper cold compress:relieve headache,fever,toothache hot ... Gel PVC Slipperhelp stimulate blood circulation can relax and gently massage. Certification MSDS, CE, SGS, FDA, ISO13485...PVC ... helps stimulate blood circulation2.can relax and gently massage your feet during jogging, standing and exercise3. ... -90 degree Celsius for around 3 minutes; for cold use, please place it in the freezer for ...