STAINLESS STEEL: The hot water bottle 550ml is made of high-quality stainless steel for its plating and inner liner, which is BPA-free and has excellent corrosion and oxidation resistance, so you can use the thermal travel mug to drink a variety of drinks with confidence. Compared with fragile glass bottles, the stainless steel water bottle is sturdy and durable, and even better, its body is shiny like a mirror, full of texture, like a work of art to be admired.INSULATION EFFECT: Our stainless steel flask for hot or cold drinks has a six-layer temperature barrier process, which maximizes the exchange of heat and cold between the inside and outside temperatures. It can keep your drink hot or cold for up to 12 hours. Whether it's a warm tea in winter or a cold drink in summer, the thermal flask will keep your drinks warm and taste great, no matter how much time passes.LEAKPROOF&NON-SLIP: Our hot water flask is equipped with a silicone sealing ring on the inner stopper, and the lid is precision threaded, so you don't have to worry about leakage even with frequent shaking or sudden bumps. In addition, the bottom of the metal water bottle is equipped with non-slip silicone pads to increase the friction between the flask and the tabletop, thus enabling stable placement.TWO WAYS TO DRINK: The flask for hot drink has a one-touch opening button on the inner cap, so you can pour the water into the lid and enjoy it at the touch of a button. This not only makes drinking more elegant but also gives you more control over the amount of water you drink. You can also unscrew the stopper and drink directly from the spacious spout of the insulated water bottles to enjoy a pretty cool, comfortable drinking experience!EASY TO CARRY: The insulated hot water bottles are equipped with a handle that makes them easy to carry, so you can easily take the thermal flask for hot drink with you when you're on the go, whether you're walking or running, the travel mug with handle is always by your side. What's more, the lid of the hot water bottle with its elegant ripple design and high-quality stainless steel texture, will ensure you stand out when you use it!