Ultra-light collection cups, convenient at home or on the go: up to 3x lighter than fully wearable pumps; compatible with Premium, Advanced, and Hands-Free electric breast pumps Confidence: the see-through collection cup provides an unobstructed view inside to correctly place your nipple and visualize your milk flow to track the volume of breastmilk The collection cup is a breeze to take apart, clean by hand or a dishwasher, disinfect, and assemble The unique SkinSense silicone breast shields are designed for ultimate comfort, softly shaping around your breasts using your body's natural warmth; they are made with food-grade silicone Find the right fit: the range of breast shields and shield insert sizes fits 99% of moms¹ − they're available to buy separately; check your nipple size with the included sizing card or a ruler