Chicco Duo™, the first hybrid baby bottle offering the purity of glass and strength of plastic in one bottle. Duo bottles are lightweight, unbreakable, and baby’s milk touches pure glass. An advanced technology used in pharmaceutical products bonds micro-thin layers of glass inside to clear premium plastic outside. All aspects of the bottle and nipple were developed and tested for safety, function, comfort, ease of use and baby & parent acceptance. A global team of scientists, designers, engineers, researchers & doctors transformed a medical vial technology into a breakthrough baby bottle.