Features: Comotomo baby bottles are deisgned to most closely mimic breastfeeding to reduce bottle rejection. The ultra wide-neck design allows easy cleaning by hand without a brush. This bottle is safe in the microwave, boiling water, dishwashers and sterilizers. The nipple and body is made of 100% safe hygienic medical grade silicone. Our bottles are equipped with truly innovative vents that are smartly designed to prevent colic, while completely eliminating annoying leaks.