100% silicone. Allow maximum contact with skin. Only nipple shields on market with low sides to ensure baby’s nose and chin make contact with mother’s breast. Thin silicone provides optimal fit. Embossed on edges to help put on and remove shields. Slightly flattened teat, designed to ensure a perfect latch on the nipple. Special cute in the silicone allow milk to flow naturally and continuously and avoid stagnation. Includes practical case that can be sterilized at the same time as the shields.