Is your coffee always too hot or too cold? Traditional mugs release the heat in minutes, leaving you with ice cold coffee. And stainless mugs keep your coffee scalding hot, making it impossible for you to drink it. Meet the 16 oz. Ninja Sip Perfect Travel Mug - the mug that controls the heat for the perfect sip. No hacks, no gimmicks, no cords, just the perfect sip right when you need it. The Heat Store Core absorbs heat to bring your scalding hot drink down to the perfect temperature in minutes and redistributes heat back into your drink to keep it at the ideal sipping temp for hours. No more burning your mouth on scalding coffee! This durable 18/8 stainless steel bottle resists scratches and dents and fits in most cupholders, making it ideal for life on the go!