Dr. Brown's Options+ bottles are designed to make feeding time easier. These anti-colic bottles have an internal vent system, clinically proven to reduce colic, spit-up, burping, and gas. The wide-neck design and breast-like nipple shape encourages a proper latch. The glass construction is thermal shock-resistant, allowing it to withstand hot and cold temperatures. This set of bottles are safe for use in dishwashers, electric and microwave sterilizers, or boiling water.