Medela PersonalFit Breast Shields Medela offers five sizes of Medela contact breast shields to meet every mum's needs and to ensure high comfort and efficiency during pumping. The right fit for you Every woman is unique one breast shield size does not fit all. That is why Medela offers a wide range of breast shield sizes to meet every mum's needs. Lactation professionals agree that proper breast shield fit is essential, not only for comfort, but also for expressing milk effectively. The PersonalFit breast shields ensure high milk volume, good breast drainage and comfortable pumping and prevent nipple trauma. For good results, combine the breast shields with the natural physiological suction rhythm of a Medela 2-Phase breast pump (like Medela Swing and Medela Symphony). Benefits of PersonalFit breast shields Combine PersonalFit breast shields with Medela breast pumps for efficient pumping. The PersonalFit breast shields are designed for an individual and personalised fit. The interchangeable breast shields are available in five different sizes and made from BPA-free materials.