Glass is made of high quality borosilicate, which is robust (but doesn't easily bounce). It is heat resistant and durable which means that it can be knocked about quite a bit and can be used for different drinks. Cap and sleeve are made of top class food grade silicone, it feels good whether you are drinking or holding it, this is because we want you to enjoy your drink. It is also made using Tritan, which is FDA approved. It is BPA free and works with hot or cold drinks.
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