High tech insulation methods prevent heat transfer to the outer walls of the tumbler, keeping your cold drinks ice-cold for up to 24 hours & your hot drinks scalding-hot for up to 6 hours. Our stainless steel tumbler use a sweat free design that prevents any temperature changes or condensation from forming on the outside, making sure that this cup never leaves a spot & you never burn yourself again! This makes a safe, green, flavor free and healthier alternative to plastic bottles and cups. Save money on disposable cups that won’t keep your liquids hot or cold by buying this cup that lasts a lifetime.