DOUBLE WALLED: made of borosilicate glass, this insulated glass bottle stays cool to touch and helps to keep your drinks hot or cold. TRAVEL FRIENDLY: take this bottle on every adventure - thanks to its secure screw top lid, it won't leak in your bag, car or backpack. FOR HOT OR COLD DRINKS: its leakproof lid keeps things totally mess-free. USEFUL INFO: this double walled water bottle holds 450ml; non toxic; BPA free; dishwasher safe; 12 month guarantee.