The adiri™ Natural Nurser Ultimate Bottle is 100% polycarbonate-free (no phthalates, latex or vinyl chloride) and bisphenol-A (BPA) free. Designed with the help from doctors, moms and lactation consultants, it enables all babies and all parents to have access to a better bottle option- a bottle that is made of the highest quality materials and a superior design, but that is still easy to use. Includes a sleek cover that protects the bottle from getting dirty and keeps the nipple from leaking during transport. Each stage holds 8 oz. of fluid and is dishwasher safe! They can be boiled or sterilized using a basic sterilizer along with being warmed using adiri™ warming caps.