HYDY vacuum thermal series observes the stringent quality control in line with the Swiss SGS safety standards. It is made using advanced 18/8 (304) stainless steel food-grade, non-BPA (BPA free) and other harmful substances. Whether you are in your office, gym or enjoy the outdoors under the warm sunshine, a double stainless steel bottle is designed for 12 hours of hot thermal insulation and 24 hours cold thermal insulation, no matter in what kind of environment. 12oz.