This Pura Sport 16oz (475ml) insulated stainless steel bottle is ideal for school, work, at the gym or outings. Its double layers of stainless steel insulates the contents and keeps it WARM or COLD for up to 6 hours (cold for up to 24 hours with ice cubes)! It is lightweight and made from safe, high grade, anti-bacterial, #304 stainless steel, and unlike other stainless steel bottles that use plastic tops, Pura’s Big Mouth® Sport top is made from 100% medical grade silicone, so you can be sure that you are truly using a 100% NonToxic Certified drinks bottle (BPA/BPS-free). The silicone sleeve makes handling the bottle so much easier and the bottle has a large opening for easy pouring and filling. Pura recommend hand washing their insulated bottles. The bottles can be used with any of the  silicone lids including the sippy cup, straw bottle or infant bottle by simply changing the lid.