With the PersonalFit Flex breast shield you can easily adapt the way your breast shield fits to help you find the most comfortable, most efficient position to pump, even as your breast shape changes. It’s a whole new pumping experience, personalised for mum. It’s available in 4 different sizes for maximum comfort and pumping efficiency - 21mm, 24mm, 27mm and 30mm. The rim of the breast shield is made with a soft, natural-feeling material that lays smoothly on the breast for comfort. More milk and comfort, as tested with mums¹ The new PersonalFit Flex breast shield was developed with the help of a team of research scientists and breastfeeding mums. It’s designed to easily adapt to your shape, and encourages your milk flow by helping prevent compression of the milk ducts. This makes it easier for every mum to find the pumping position that’s most comfortable for her. The result? More comfortable, more efficient expression, shaped around you. Our research scientists tested the PersonalFit Flex breast shield in four clinical studies with breastfeeding mums. Like every Medela product, our Flex breast pumps are designed to make breastfeeding easier, so you can feed your baby with your amazing milk for longer.