Made from high quality double-walled stainless steel, it?s perfect for whatever you?re brewing. Coffee, beer, cocktails or tea, it will keep drinks hot for up to 5 hours, or cold for 8. The lid is 100% leak proof and opens with one hand – ideal for multi tasking when you?re out and about. Lockable lid and easy to disassemble to clean. This is a no-nonsense, built-to-last, designed to function tumbler that will last you a lifetime. Handwash only