The PersonalFit Flex breast shield is designed to adapt to the shape of the breast and prevents compression of the milk ducts, thus promoting milk flow. PersonalFit Flex breast shields are available in 4 sizes. The PersonalFit Flex breast shield is reusable and compatible with Medela's Swing Maxi Flex, Swing Flex, and Freestyle breast pumps. PersonalFit Flex breast shields are available in 4 sizes. The oval shield can be rotated 360° and positioned as desired, allowing the mother to find the most comfortable pumping position. The result is more comfortable and effective pumping. Features: With a soft, adaptable rim. Its oval shape can be rotated 360° for a comfortable and flexible fit on the breast. The 105° angle reduces pressure on the breast and stimulates milk flow. The connector includes an overflow protection system so the mother can pump in the most comfortable position. Size: L