Naturally shaped， squeezable， soft， skin-like silicone - Ideal for breast-fed babies;Innovative & non-leaking anti-colic vents;Unique interlocking feature and no-drip design;Wide-neck design for easy， brushless cleaning;100% safe materials: BPA， PVC， Phthalate free; Safe in: microwave， boiling water， dishwashers and sterilizers