Cups & Mugs by RTIC. Details:With RTIC’s Coffee Mug, your energy will last all day long. Built with stainless steel, double-wall vacuum insulation, this mug strikes the perfect balance between quality and comfort: Your brew will stay burning, but your hand won’t. And when you’re counting on coffee to carry the day—there won’t be any surprises. The splash-proof lid lets you know just how much liquid you have left. Whether you’re enduring a long day at the office or a long trek outside — never underestimate the power of caffeine.