The Qwetch thermos bottle is enjoyable anywhere and anytime. It keeps your drink warm for 12 hours and cold for 24 hours. This is the ideal solution for savoring your hot or cold beverage on the go or at home. The Qwetch thermos bottle is thus a replacement for plastic bottles. It is double-walled, with both the inner and outer walls made of stainless steel 304 (18/8). The inside of the lid is also made from stainless steel 304 (18/8). The inner wall is uncoated and unpainted, unlike aluminum containers, and does not alter the taste or aroma.