The thermos bowl is made of stainless steel. Unique insulation due to a polyurethane filling, keeps warm or cold for up to 5 hours with lid. Karl Weis The company Karl Weis was founded in 1903 and has since been an owner-managed family business based in Murr, Baden-Württemberg. Karl Weis specialises in the production of high-quality stainless steel kitchenware. The range includes approx. 1200 products including a variety of sizes and different variations. Let yourself be impressed by the variety and quality of the Weis brand