High-quality stainless steel <br>The inner liner and outer shell are made of 304 or 316L food-grade stainless steel, which is corrosion-resistant, rust-resistant, ensures safe drinking water without odour, and is suitable for long-term use.<br><br>Functional features <br>Long-lasting heat preservation and cold preservation <br>Double-layer vacuum insulation technology, heat preservation up to 6-12 hours, cold preservation effect is also excellent, suitable for all seasons. Some styles support 24 hours long heat preservation.<br>Portable and practical design <br>Lightweight cup with non-slip handle or carrying strap (optional on some models), easy to hold in one hand or carry around.<br>The spout is designed to fit the lips for smooth drinking without spilling; some models come with a dual straw spout or straight spout.<br>Leak-proof seal <br>Silicone seal + leak-proof lock design, 360 shake does not leak, can be put into the backpack or car use.<br><br>Details and Craftsmanship <br>Safe Material <br>Lid, straw and other accessories are made of food-grade PP or silicone, BPA-free, healthy and environmentally friendly.The surface of the inner liner is smooth, easy to clean, and not easy to residual odour.<br><br>Application Scenario <br>Outdoor sports: hiking, mountaineering, cycling to replenish water.<br>Office study: alternative disposable water cups, environmental protection and health.<br>Travelling: drinking hot water or cold drinks on the plane or train at any time.<br>Parent-child use: children's models can choose a small capacity version, safe materials to make parents more assured.