Made from high-quality Swiss polyamide, Born Free products are completely free of Bisphenol-A (BPA). Plus, they feature an innovative air vent that helps prevent side leaks, reduces colic symptoms like gas and spit up, and decreases the risk of middle ear infection. The special design allows you to shake bottles freely with no spills, and its wide-neck makes cleanup easier than ever! Set includes 2 bottles, 2 nipples, and 2 covers.