Nipple pain, flat or inverted nipples, and engorgement are some of the most frequent issues faced by breastfeeding mothers that Medela softshells assist in resolving. Softshells provide relief from these situations while being comfortable to wear. Comfortable backs with flexibility. Low profile construction for a natural look beneath clothing. Safe for mom and baby due to lack of BPA. BPA has never been used in the manufacture of any Medela breastmilk bottles or anything that come into contact with breastmilk.