Premium Insulated Mug for Hot and Cold Beverages The Zojirushi SM-SD series is a line of high-quality stainless steel vacuum-insulated mugs designed to keep your beverages at the perfect temperature for hours. Available in various capacities, including 360ml, 480ml, and 600ml, these mugs are ideal for daily use, whether you're commuting, at the office, or on the go. Whether you're looking to keep your coffee hot during your morning commute or your water cold during a workout, the Zojirushi SM-SD series offers a reliable and stylish solution.