"Breast shells" are small devices worn inside a bra to help protect and support the breasts. They are used by some women to alleviate pain, prevent nipple chafing, and collect milk leakage during breastfeeding. Full definition
Once your baby is born, you can use breast shells for around 30 minutes before a feed. (expressing-mama.com)
If you have any questions about the use of breast shells or where to get them, talk to your doctor, a lactation consultant, or a local breastfeeding group. (verywellfamily.com)