The WORTHBUY 18/8 stainless steel double-layer cooler mug is an excellent choice for coffee lovers. Made of food-grade 18/8 stainless steel, it is resistant to oxidation, corrosion, and rust and features an insulated double-layer design to ensure your drinks stay hot and cold for longer. It also has a unique built-in straw for convenient use. With its portability and durability, this reusable mug is ideal for on-the-go coffee drinkers.