The Sendoso Swig's double-wall vacuum insulated tumblers will keep your drinks seriously cold (or hot!). Swigs are engineered to maintain the temperature of your beverage for the maximum time possible. Crafted from 304 grade 18/8 stainless steel. All drinkware is BPA free, FDA approved, and easy to clean by hand. The clear push-seal lid seals tightly to keep spills under control, and the double-walled insulation keeps your hands dry and comfortable. Take a Sendoso SWiG!