Customizable Fit: With the PersonalFit Flex breast shield, you can easily adapt the way the shield fits to find the most comfortable and efficient position for pumping, even as your breast shape changes. This personalized fit enhances comfort and milk flow. Soft Rim: The rim of the breast shield is made with a soft, natural-feeling material that lays smoothly on the breast, ensuring comfort during pumping sessions. More Milk and Comfort: Developed with the help of research scientists and breastfeeding moms, the PersonalFit Flex breast shield encourages milk flow by helping prevent compression of the milk ducts. This results in more comfortable and efficient expression, tailored to your individual shape. Clinical Testing: The PersonalFit Flex breast shield has been tested in clinical studies with breastfeeding moms, proving its ability to deliver more comfort and efficiency across pumping sessions. Size Options: Available in four different sizes (21mm, 24mm, 27mm, and 30mm), ensuring maximum comfort and pumping efficiency. The 21mm size is suitable for smaller breast sizes. Angled Design: The breast shield features a 105 angle that improves fit for better milk flow, enhancing the overall pumping experience. Oval Shape: The shield's oval shape can be rotated 360, allowing for flexibility and customization to suit your comfort and pumping preferences. BPA-Free Materials: Made from BPA-free materials, ensuring safety for both mom and baby. Overall, the Medela PersonalFit Flex Breast Shield in size 21mm offers a comfortable, efficient, and customizable pumping experience, helping moms express milk with ease and confidence.