Allows baby's skin to breathe \ extra large air holes that ventilate the skin to stay drier, while your baby calms down. \ ultra-firm nipple \ the ultra-firm nipple respects the natural shape of the palate, teeth and gums. \ 100% food-grade silicone nipple \ we consciously choose silicone as the material for the ultra soft and ultra air nipples, as it is a safe and inert material, which is widely used in medical applications and does not contain hazardous chemicals, endocrine disruptors (e.g. bpa) and allergens. \ natural oral development \ the orthodontic, symmetrical soft silicone nipples are designed with natural oral development in mind. \ natural feel for baby \ the textured silicone nipple is designed to mimic the feel of a mother's breast. \ sterilizes in 3 minutes, for convenient sterilization \ the travel case that comes with the ultra soft and ultra air pacifiers also doubles as a sterilizer. all you have to do is add a little water and put it in the microwave. that way it will be clean for the next use. \