Air-free FEEDING: innovative silicone pouch collapses as baby drinks, cuts down on the ingestion of air to decrease painful gas, reflux, colic and Burps | No straws, vents or valves: other bottles require vents and valves that allow air back into the bottle | Modeled AFTER moms: designed to mimic the natural form and feel of mom for baby feeding, easy to latch and encourages proper tongue positioning | Includes: Each of these 3 silicone baby bottles includes a shell, stage 2 medium flow nipple, collar, reusable silicone pouch, and cap | Easy to clean and washable: 100% dishwasher safe bottles, can be boiled, microwaved, frozen and sterilized