Whether you are starting your day with a double shot of espresso or ending it with a glass of bourbon, the Doppio mug is a perfect size. This compact stainless steel mug, with its unique double wall and press-fit lid, can keep a coffee hot on the frostiest of winter mornings or ice cold on a hot summer day. Clean and durable, made of pure 304/18-8 stainless steel, this compact double-walled coffee cup keeps hot and cold beverage temperatures steady without burning hands or forming condensation. The convenient sip-top keeps bugs out and helps prevent sloshing.