Medela Breastshells (pack of 2)Description If you have sore or cracked nipples, Medela breast shells protect them and allow skin to recover by preventing your clothes from rubbing on them. Breast shells fit inside your bra to prevent fabric rubbing against sensitive or sore nipples, allowing your skin to recover and promoting healing. Its a good idea to wear a nursing bra when using breast shells, as these tend to be a bit roomier than a typical bra, so its easier to fit them