HEAT THERAPY: Warm your breasts to help encourage milk output, let-downs, relieve mastitis and plugged ducts. COLD THERAPY: Cool your breasts to help relieve pain and swelling due to engorgement and mastitis. INCLUDES: 2 reusable gel packs & 2 plush cloth covers FOR HEAT THERAPY: Heat one pack at a time lying flat. Do not place cloth in microwave. 700 WATTS: 15 seconds 1,000 WATTS: 12 seconds 1,250 WATTS: 10 seconds 1,600 WATTS: 6 seconds Additional heating may be done in 5-second increments until the desired temperature is reached after the initial heating. Do not heat the pack for more than 20 seconds total. Place pack in cloth and always test the temperature of the pack before application. FOR COLD THERAPY: Place pack with the cloth in the freezer for at least 2 hours before use. I have a bunch of baby, postpartum, and nursing supplies listed! Check them out and bundle! ***My Posh Store has almost 200 5-Star Reviews! Ships same or next day if purchased during the week! Ships Monday if purchased on weekends! Please reach out to me for any concerns or questions!***