WEE AIR system of the soother allows air flow in and this allows the nipple stay soft and keep its shapeThanks to the softness of the nipple, it will support the natural development of the palate and the teeth even if it is moved up and downDesigned to ensure it will fit perfectly in the baby mouth with maximum comfortSilicone is odorless, transparenttastelessIt is resistant to pulling and easy to cleanBPA-free, manufactured at FDA standards Orthodontic silicone teat supports healthy palate development and teeth growth, as well as supporting natural sucking motion of the baby