If you couldn’t guess based on the name, this travel tumbler is made of stainless steel to keep your drink nice and cold, even on the hottest summer days! Mary-Kate and Ashley who? Features: • 3” x 7” x 3” • Infused acrylic • Stainless steel body • Hard plastic spill-proof lid • 16 oz. capacity • Insulated double wall • Keeps drinks cold/warm for up to 6 hours • Fits most standard cupholders• Hand wash only • Do not microwave • BPA-free, lead-free, phthalate-free