Chicco Duo Deluxe Hybrid Baby Bottle Gift Set with Invinci-Glass Inside/Plastic Outside in Clear/GreyDUO is an anti colic bottle that uses a breakthrough medical glass technology that permanently bonds a micro thin layer of unbreakable INVINCI GLASS to the inside of a premium plastic bottle resulting in the FIRST HYBRID BABY BOTTLE. It features the best of both, the lightweight durability of plastic on the outside and the protective properties of glass on the inside. It wont stain, discolor, retain odor or funky aftertastes. Most importantly, your