Luxury large re-usable fabric Hot-Cold gel pack.Cold therapy:* Store in freezer for 1 hour to use for cold therapy* Cold therapy used for swelling reduction, tooth ache, headaches and reducing feversHot therapy:* Place in microwave for 30 seconds or Boil for 7 mins to use for hot therapy* Hot therapy used for muscle relief, back pain, sinusitis, menstral cramps