Some mothers may experience milk leakage during or between breastfeeding sessions. Medela Breastmilk Collection Shells are designed to deal with leakage hygienically and discreetly, and collect breastmilk from one breast during breastfeeding. The low profile design allows them to be worn under a Medela bra without being visible and the soft silicone backs make them comfortable to wear for longer periods of time and feature a built in spout to allow easy removal of the collected milk. They can also be used with a breast pump bra.