Luc Et Léa Ergosense Silicone Anti-Colic Teats 4m+ 2 Units are designed to ease the transition from breast to bottle and promote digestive comfort.Ergosense teats are made of silicone, a material that is both neutral and durable. With their anti-colic valve, they minimize air absorption, promoting digestive comfort and reducing regurgitation. Their ergonomic shape mimics the natural position of the baby's mouth during breastfeeding. In addition, they incorporate a structural reinforcement to prevent crushing of the teat, regulate the flow and make feeding more comfortable.for babies from 4 months and wide-neck bottles.variable flow.