Lansinoh Therapearl 3-in-1 Breast Therapy brings advanced relief for a number of conditions associated with breastfeeding. Therapearl can be used hot or cold and has also been specially designed to fit around your breast pump to encourage let down and promote faster milk flow. Reusable and non-toxic, these unique packs are doctor designed and lactation consultant approved. Use Therapearl 3-in-1 Breast Therapy hot to help relieve plugged ducts and mastitis. It can also be used just before breastfeeding when breasts are engorged, and before or during pumping sessions, as the heat encourage let-down and milk flow. Use Therapearl cold to help provide relief from pain and swelling due to engorgement. Can be used warm or cool, or with a pump.