Our water bottle is equipped with double walled vacuum insulated technology to keep favorite beverage hot/cold. Built in with sweat-proof design while maintain hot beverage for 6 hours and cold beverage for 12 hours. The lid is tight enough that tipping the tumbler over doesn’t mean you’re going to lose some of your valuable coffee. This amazing metal water bottle is made from BPA-free, food-grade stainless steel. It will not rust, can withstand rust, corrosion, dents, and is built to last. Its food grade material can meet people's safe and healthy needs.