12 oz stainless steel NEW SEALED SAY GOODBYE TO SPILLS with Mighty Mug, the only mug that Grips when Hit, But Lifts For Sips. Some call it magic, others call it witchcraft - but we call it Smartgrip, our patented technology. See why the press loves Mighty Mug, and more than 2 million have been sold worldwide. 4 HOURS HOT & 24 HOURS COLD - In addition to the amazing no-tip feature, Mighty Mug has all the bells and whistles of a great travel mug, including triple-walled insulation; to keep your cup of coffee hot and your cold drinks ice cold. 360° DRINKING LEAKPROOF LID - Keep your eyes on the road and drink from any angle, 360° degrees, seven days a week. The leakproof locking lid makes the morning dash spill-free whether you are running to catch a train or if it’s thrown in your bag. CAR CUP-HOLDER FRIENDLY With all of the accident-proof travel features, the Mighty Mug is a go-to road trip must-have.