Come and see our amazing products. Premium Drinkware uses double-wall vacuum insulation technology, with no medium for heat to transfer, your drink's temperature will not be impacted by the outside temperature. The double-wall vacuum will keep your beverage cold up to 24 hours and your drink hot up to 12 hours. Crafted from 304 grade 18/8 stainless steel, highly resistant to rust, absorbing odor, retaining taste and easy to clean by hand. Pls confirm further with us if any query about packing info, inventory status and time schedule.