This tumbler features double-wall vacuum insulation designed to keep beverages hot or cold for extended periods.It comes with a dual-purpose lid that allows for both sipping and using a straw, and is generally described as leak-proof.The product is available in multiple sizes, commonly 600ml or 900ml, and typically includes a sturdy carrying handle.Crafted from durable 304 or 316 stainless steel, it is designed for portability and daily use for commuting or travel.