Medela SoftShells for Sore or Inverted Nipples Medela SoftShells have a streamlined, close fitting shape that creates a flattering appearance and they also have a soft silicone back for a comfortable fit. Highly absorbent foam inserts offer optimal protection against leakage. Softshells for inverted nipples have a smaller opening in the back and can be used to draw out flat or inverted nipples. SoftShells for sore nipples have a larger opening which protects sore nipples, but does not cause them to protude as the Inverted Nipple shells do. Shells and backs are dishwasher safe. Please use the "drop-down" menu to specify your preference between SoftShells for Sore Nipples or for Inverted Nipples.