Each Pura 9oz insulated baby bottle is 100% BPA/BPS-free. Both the bottle and collar are crafted from safe, high grade #304 stainless steel and their natural vent teat (medium flow) is made from medical grade silicone, a much safer option than plastic. The natural vent teat is designed to mimic the variable flow of breast milk, encourage proper latching and helps to prevent colic, aiding proper digestion. The bottle's double layer of stainless steel will keep liquids cold for up to 12 hours (with ice cubes). 
Each bottle comes with a soft silicone sleeve which makes holding the bottle easier, a medium-flow Pura teat and a silicone travel cover. Easy to read measurements on the inside make preparing your baby's milk simple and the wide mouth allows for easy cleaning, pouring, and filling. This bottle easily converts into a sippy bottle, straw bottle and then to a lunch box friendly water bottle by simply swapping the nipple out for another Pura silicone lid.