Mighty Mug Ice 20oz Hot/Cold Tumbler - Blue Wont fall over when when bumped into, but lifts 100% naturally. Smartgrip function never wears out and is guaranteed to work on any smooth, flat surface (i.e. your work desk or table) Avoid ruining important documents and sip around your electronics worry-free Keep your drink at the perfect temperature with this double wall, sweatproof mug Conveniently fits into car cup holders and grips firmly on boats, trains and planes