500ml stainless steel heat exchanger-high quality insulation to keep cold and heat

- Keep your drinks hot or cold for hours thanks to this heat sink made of food-grade stainless steel, known for its strength and resistance to rust and corrosion. - Designed with double wall technology and vacuum insulation to keep drinks cold for up to 24 hours - Convenient usage experience, suitable for daily use at work, school, sports, or while traveling