Therapeutic Relief: Breast Pad provides soothing relief for the most common breastfeeding; cold therapy is great for relieving engorgement, hot therapy helps relieve mastitis and encourages milk let-down while using a breast pump. Breast Pump Aid: Heat the packs and insert in the covers and snap onto any breast pump to increase milk production and reduce time spent pumping. Cold\/hot Compress: Simply place the chest pad in the refrigerator or hot water\/microwave until the desired temperature is reached. Note: Refrigerate for 20-30 minutes. Heat: soak in hot water for 5-8 minutes\/heat in microwave over medium or low heat for 2-3 minute. Safe to Use: It is made of non-toxic gel, and there is a velvet insulation cover on the outer layer, which is not irritating to the skin, please rest assured to use. PLEASE NOTE that when heating, do not heat the velvet cover together. Multiple USES: Breast pads can be used for breast distension, providing soothing cool or heat relief,reducing pain,blocked ducts and mastitis. It can also be used for hemorrhoids, swelling and pain, or to relieve redness and fever caused by trauma.