Double wall, food-grade stainless steel | Keeps iced drinks cold over 36 hours | Keeps hot drinks hot over 2.5 hours | Your choice of colorful, leak resistant lids, perfect for use with or without a straw | Without lid, capacity increases by 4 ounces | Vacuum insulated | Retail style gift box included | Patent D798,112 | Includes extra long straw | Hand wash recommended and not intended for microwave use