SUS304 STAINLESS STEEL MATERIAL: The stainless steel insulated water bottle is made of 18/8 food grade 304 stainless steel, which is BPA-free, rust-proof, and non-toxic. stainless steel inside and out means no metallic aftertaste. Does not contain any harmful substances, you can live a healthy life every day. Flask for hot drink with black matte finish is sweat-free and offers a firm grip against slips, don't worry about peeling or rusting. MULTIFUNCTIONL LID: Made of heat and condensation-resistant ABS material, which is stronger other material. Ergonomic and thumb groove design handle allow for thumb rest and easy holding. Comes with cup fixed to lid which can be used to drink your coffee on the go. Suitable for home and office use, school functions and outdoor activities, such as party, picnic, camping, rv, etc, which are wonderful substitutes for paper cups. KEEP HEAT-COLD AND LEAK-PROOF STOPPER: Our double layer vacuum insulated sports water bottles keeps hot and cold liquids (water, coffee, tea) cold for 12 hours and keeps them warm for 12 hours. Stainless steel water bottle with a silicone seal and a one-button press on the inner plug of the water outlet. Vacuum button is a standard threaded design. The high quality multicolor water bottle design is suitable for a variety of people, making you more solemn