Sore or cracked nipples can be a significant cause of breastfeeding difficulties and Medela's products can provide relief and support. The Medela Hydrogel Pads provide an instant cooling effect when applied to the skin. The gel acts as a heat sink, reducing the temperature of the skin at the interface with the gel. This effect can be prolonged if the Hydrogel pad is refrigerated for approximately one hour before application. Please seek advice from a healthcare professional when using this product.