Buzio 40 oz stainless steel sports water bottle is Safe and Reliable. It's made of BPA-Free, food grade 18/8 stainless steel, double wall vacuum insulated. Eco-friendly, lead free, rust proof and leak proof, no sweat, no condensation any more. This thermos water bottle 40 oz keeps your drinks ice cold for 48 hours and hot for 24 hours. No sweat on the exterior side to keep your hands comfortable while holding. Drinking more water with this 40 oz stainless steel water bottle, suitable for any sports activities, work, school and any scenario in your daily life. Our water bottles are designed with perfect size for daily use.