Every woman is unique - one breastshield size does not fit all. That is why Medela offers a wide range of breastshield sizes to meet every mom's needs. Lactation professionals agree that proper breastshield fitting is essential, not only for comfort, but also for expressing milk effectively. The PersonalFit Breastshield range helps to optimize milk volume and breast drainage, when using the right size. Designed for an individual and personalized fit, PersonalFit Breastshields provide comfort during pumping. Available in five different sizes made from BPA-free materials, PersonalFit Breastshields are compatible with all Medela breast pumps.