Soft, flexible shield: Our shield technology lets this soother follow the natural curves of your baby's face, meaning fewer skin marks and less irritation on its cheeks Rounded shield: Our rounded shield minimizes pressure on baby's cheeks for extra gentleness to the skin while suckling BPA Free: Our Philips Avent Ultra Soft and Ultra Air Nipples are made of 100% food-grade silicone are come free from hazardous chemicals and substances like BPA and allergens Natural oral development: Our orthodontic, symmetrical soft silicone nipples are designed for natural oral development Natural feel for baby: Natural, comfortable feel for baby with our textured silicone nipple that's designed to mimic the feel of moms breast