And the result? More comfort, more efficiency, and an average of 11% more milk compared to a conventional breast pump. Our researchers tested the PersonalFit Flex breast shield in four clinical studies with breastfeeding mothers. Through over 1,000 pumping sessions, they found that the new shape provides greater comfort and efficiency, as well as an average of 11% more milk production compared to a conventional breast pump. Compared to standard breast shields with a 90° opening, the new 105° angle shields fit better across different breast shapes and sizes. This also helps milk flow more freely, possibly due to less compression of the ducts that carry milk to the breast. And because it allows 360° rotation, the PersonalFit Flex breast shield can easily adapt its position to suit your breast.