This is a black, double-layer insulated flask constructed from durable 304/316 stainless steel, ensuring long-lasting temperature retention for both hot and cold beverages. Its design features a multi-layer construction including a copper plating layer and vacuum insulation for superior thermal performance. The bottle boasts a 100% leak-proof design and comes with a convenient wrist strap for easy portability. With its sleek metallic finish and screw-top lid, it is ideal for outdoor activities such as fishing, mountaineering, picnics, and running, keeping your drinks at the desired temperature wherever you go.