- Wide base and nipple shape encourages proper latch - Double-venting system reduces nipple collapse and colic - Nipple made from soft, pliable, medical-grade silicone - Nipple promotes proper oral development and healthy teeth - Nipple flow rates allow natural-paced and relaxed feedings - Dishwasher safe -Stainless Loop Cap - Designed to fit the universal, external thread design on the wide-mouth bottles - The outside cap is BPA-free polypropylene (pp#5) - The inside cap is 100% stainless steel (creating a entirely stainless interior)