Naturally shaped, soft, silicone nipples - ideal for breastfed babies . Designed to eliminate nipple confusion issues . Dual anti-colic vents prevent unwanted air intake and reduce colic. Easy to Clean: Safe in microwave, boiling water, dishwashers and sterilizers. Safe Feeding: Made of 100% safe, hygienic silicone. 100% safe materials: BPA, PVC, Phthalate free