The COLD-1 Vacuum Insulated Thermal Tumbler is designed to keep your beverages hot and cold for hours.It even keeps ice solid in the sweltering heat.The extra large tumbler is sweat proof and designed to keep its contents cold 3 times longer than double wall plastic tumblers.This insulated tumbler features a patent pending ergonomic 3-in-1 lid that allows you to sip, drink or gulp your beverage.It is made with 18/8 stainless steel and 100% BPA-free materials.