1.PREVENTS CHOKING & COLIC: The off-set nipple mimics natural breast, allows for easy latching and reduces bottle rejection. Dual anti-colic vents reduces air ingestion and stomach upsets. It encourages upright feeding posture and minimizes choking. 2.EXTREMELY SAFE & EASY TO CLEAN: Our bottle is made with the highest purity food-grade silicone. It is BPA, PVC, Lead and Phthalates free. 3.AIR-FREE FEEDING: Innovative silicone pouch collapses when baby drinks and cuts down on the ingestion of air to decrease painful gas, colic and burps 4.MODELED AFTER MOMS: Designed to mimic the natural form and feel of mom for baby feeding, this nipple is easy to latch onto and encourages proper tongue positioning 5.DISHWASHER SAFE BOTTLES: Made without PVA or BPA and are safe to boil, microwave, freeze sterilize