Bubba HERO Vacuum-Insulated Stainless Steel Travel Mug with Handle, 18 oz, Gunmetal Double wall vacuum insulated stainless steel, keeping beverage inside travel coffee mug hot up to 6 hours or cold up to 24 Leak-proof lid that is designed for a premium drinking experience with the perfect flow and a lock li Silicone base provides a skid proof bottom to prevent tumbler from sliding Top rack dishwasher safe; Not for use in the microwave Lifetime Guarantee