Comotomo baby bottles are deisgned to most closely mimic breastfeeding to reduce bottle rejection and nipple confusion issues 
Ultra wide-neck design allows easy cleaning by hand without a brush. Nipple and body is made of 100% safe hygienic silicone 
Safe in microwave, boiling water, dishwashers and sterilizers. Tips - If the bottle is leaking,make sure there's not blockage on the vents. You can wash it in running water, or sterilize it in boiling water for 5 minutes.Also,make sure that the nipple, ring, and bottle base is aligned properly and screwed tightly and thoroughly 
Maximum temperature for bottle and nipple is 180 degree Celsius and 120 degree Celsius for cap and outer ring 
Dual anti-colic vents prevent unwanted air-intake and reduce colic