This tumbler is constructed of 90% recycled 18/8 stainless steel and is BPA-free, emphasizing sustainability. It features double-wall vacuum insulation to keep drinks cold for extended periods (e.g., up to 34 hours for cold beverages). The FlowState™ screw-on lid has a 3-position rotating cover for versatile use: straw opening, wide mouth for drinking, and a full-cover top to prevent spills. It includes a reusable straw and a comfort-grip handle, and its base is designed to be car cup holder compatible. The tumbler is dishwasher safe for easy cleaning.