The Kiinde Active Latch Silicone Baby Bottle is designed to provide a seamless transition between bottle and breast. It features a unique gas-eliminating feeding design with a collapsible inner sleeve that eliminates gas-inducing air as your baby drinks, helping to relieve colic. The silicone inner sleeve can be flipped inside out for easy cleaning and can be boiled, sterilized, microwaved, or frozen. The bottle system has no straws, vents, or valves, making it easy to clean and assemble. All parts are BPA-free and phthalate-free, and safe for the top rack of your dishwasher. The package includes 2 medium-flow Active Latch nipples with leak-proof snap-on covers.