Double Wall Vacuum Sealed Stainless Steel Tumblers will keep your favorite on-the-go beverages hot for six hours or cold for twenty-four hours. It features a straight， slim design that fits in most vehicle cup holders. The Tumbler comes with a screw top that provides a secure fit and a slide lid to help keep beverages at optimum temperature and prevent spills. Hand washing is recommended.18/8 double-wall stainless steel， vacuum-sealed construction maintains the optimal temperature of cold beveragesKeeps your drinks cold for 24 hours， hot for 8 hoursDurable， threadless Tritan lid easily slides open and closed for one handed drinking30oz capacity fits in a standard sized cup holderBPA -Free