1The soft touch makes the baby feel similar to the mother's nipple, so the baby will feel satisfied. 2Made of food grade liquid silicone, more hygienic, transparent and odorless and more easily accepted by babies. 3Not easy to ageing, heat resistance and tear resistance, no harm to the baby. 4The unique ventilation system contains no other parts and is easier to clean. 5The raised design makes the baby more comfortable to suck, allows the baby's tongue to perform the same action as breast milk is sucked.