Nayad™ Vive 23 oz Stainless Double Wall Bottle has an 18/8 rust-free stainless steel construction with powder-coated matte finish. Not designed for hot liquid - use only with cold liquid - is double-walled insulated and copper-lined to keep beverage cold for up to 20 hours. Wide-mouth straw lid is 100% BPA-free with food grade silicone flip-top spout. Lid has built-in lock switch to flip-top spout up by pushing handle down. Push flip-top spout down to close and switch lock to make leak-proof. AB