To ease the discomfort of engorgement, blocked ducts and mastitis. Use warm or cool depending on your needs; Unique shape conforms to a variety of breast sizes; Soft, hand-washable fabric for added comfort. Breastfeeding is best for baby's health. However, Engorgement, Blocked Ducts and Mastitis can add discomfort to the experience of being a new mother. Breast Therapy Warm or Cool Relief Packs have been designed to bring you immediate and effective warming and cooling relief. Engorgement: Use warm before feedings to help with let down and cool between feedings to reduce swelling. Blocked Ducts: Use warm before feedings to help increase milk flow. Mastitis: Use warm before feedings to increase flow and cool between feedings to help soothe and reduce swelling. Unique shape conforms to a variety of breast sizes. May be placed in bra. Soft, hand-washable fabric for added comfort.