Think Bottles are lovingly made to enhance your drinking experience. Each bottle features borosilicate glass that can withstand extreme changes in temperature, paired with our food-grade silicone lid and band, which creates an insulating shield that is soft and a pleasure to hold. Think Bottles are absolutely dishwasher & microwave safe, though it is best to hand wash our lids. Most importantly, each bottle helps to save our planet by reducing the amount of waste generated from disposable water bottles. FEATURES 500ml Capacity Borosilicate Hand Blown Glass Food Grade Silicone Grip Please note that the Think Bottles can only be filled with non-carbonated and stable liquids such as water. Any liquid that is temperamental when heated or cooled should not be used with our bottle. Please note that the bottle should also not be subjected to extreme heat or cold (eg boiling liquids or freezing temperatures).