The Adiri Natural Nurser Ultimate Bottle is 100% polycarbonate-free and bisphenol-A free, hormone disrupting chemicals found traditionally in many baby bottles. It offers high quality materials, a graceful design, and the new Fill, Twist and Feed™ system, engineered so that a parent or caregiver can quickly prepare a bottle, even with a hungry infant under one arm. A sleek cover protects the bottle from getting dirty and keeps the nipple from leaking during transport. The Adiri Natural Nurser comes in three stages for three different flow rates. Each stage holds 8 oz. of fluid and is dishwasher safe! Adiri Natural Nursers can also be boiled or sterilized using a basic sterilizer.